0
The standard form of quadratic function is: f(x) = a(x - h)^2 + k, a is different than 0
The graph of f is a parabola whose vertex it is the point (h, k). If a > 0, the parabola opens upward; if a < 0, the parabola opens downward. Furthermore, if |a| is small, the parabola opens more flatly than if |a| is large. It is a general procedure for graphing parabolas whose equations are in standard form:
Example 1:
Graph the the quadratic function f(x) = -2(x - 3)^2 + 8
Solution:
Standard form: f(x) = a(x - h)^2 + k Given function: f(x) = -2(x - 3) + 8
From the give function we have: a= -2; h= 3; k = 8
Step 1. Determine how the parabola opens.
Note that a = -2. Since a < 0, the parabola is open downward.
Step 2. Find the vertex.
The vertex of parabola is at (h, k). because h = 3 and k = 8, the parabola has its vertex at (3, 8).
Step 3. Find the x-intercepts by solving f(x) = 0. Replace f(x) with 0 at
f(x) = -2(x - 3)^2 + 8 and solve for x
0 = -2(x - 3)^2 + 8
2(x - 3)^2 = 8
(x- 3)^2 = 4
x - 3 = square radical 4
x - 3 = 2 or x -3 = -2
x = 5 or x = 1
The x- intercepts are 1 and 5. Thus the parabola passes through the points (1, 0) and (5, 0), this means that parabola intercepts the x-axis at 1 and 5.
Step 4. Find the y-intercept by computing f(0). Replace x with 0 in f(x) = _2(x - 3)^2 + 8
f(0) = -2(0 - 3)^2 + 8
f(0) = -2(9) + 8
f(0) = -10
The y-intercept is -10. Thus the parabola passes through the point (0, -10), this means that parabola intercepts the y-axis at -10.
Step 5. Graph the parabola. With a vertex at (3, 8), x-intercepts at 1 and 5, and a y-intercept at -10. The axis of symmetry is the vertical line whose equation is x = 3.
Example 2:
Graphing a quadratic function in the form f(x) = ax^2 + bx + c
Graph the quadratic function f(x) = -x^2 - 2x + 1
Solution:
Here a = -1, b = -2, and c = 1
Step 1. Determine how the parabola opens. Since a = 1, a < 0, the parabola opens downward.
Step 2. Find the vertex.
We know that x-coordinate of the vertex is x = -b/2a. Substitute a with -1 and b with -2 into the equation for the x-coordinate:
x = - b/2a
x= -(-2)/(2)(-1)
x = -1, so the x-coordinate of the vertex is -1, and the y-coordinate of the vertex will be f(-1). thus the vertex is at ( -1, f(-1) )
f(x) = -x^2 - 2x +1
f(-1) = -(-1)^2 - 2(-1) + 1
f(-1) = -1 + 2 + 1
f(-1) = 2
So the vertex of the parabola is (-1, 2)
Step 3. Find the x-intercepts by solving f(x) = o
f(x) = -x^2 -2x + 1
0 = -x^2- 2x + 1
We can't solve this equation by factoring, so we use the quadratic formula to solve it.
we get to solution: One solution is x = -2.4 and the other solution is 0.4 (approximately). Thus the x-intercepts are approximately -2.4 and 0.4. The parabola passes through ( -2.4, 0) and (0.4, 0)
Step 4. Find the y-intercept by computing f(0).
f(x) = -x^2 - 2x + 1
f(0) = -(0)^2 - 2(0) + 1
f(0) = 1
The y-intercept is 1. The parabola passes through (0, 1).
Step 5. graph the parabola with vertex at (-1, 2), x-intercepts approximately at -2.4 and 0.4, and y -intercept at 1. The line of symmetry is the vertical line with equation
x= -1.
What else can I help you with?
When is it better to have the quadratic function in vertex form instead of standard form?
The quadratic function is better represented in vertex form when you need to identify the vertex of the parabola quickly, as it directly reveals the coordinates of the vertex ((h, k)). This form is particularly useful for graphing, as it allows you to see the maximum or minimum point of the function immediately. Additionally, if you're interested in transformations such as shifts and reflections, vertex form clearly outlines how the graph is altered.
In the vertex form of a quadratic function y equals a the quantity of x-b squared plus c what does the b tell you about the graph?
The standard form of the quadratic function in (x - b)2 + c, has a vertex of (b, c). Thus, b is the units shifted to the right of the y-axis, and c is the units shifted above the x-axis.
How do you graph y equals x squared minus 4?
its a simple parobola symmetric about y axis, having its vertex at (0,-4). we can make its graph by changing its equation in standard form so that we can get its different standard points like vertex, focus, etc.
How are quadratic equation in standard form rewritten in vertex form?
A quadratic equation in standard form, ( ax^2 + bx + c ), can be rewritten in vertex form, ( a(x-h)^2 + k ), through the process of completing the square. First, factor out ( a ) from the ( x^2 ) and ( x ) terms, then manipulate the equation to create a perfect square trinomial inside the parentheses. The vertex ( (h, k) ) can be found from the values derived during this process, specifically ( h = -\frac{b}{2a} ) and ( k ) can be calculated by substituting ( h ) back into the original equation.
What is y equals x squared?
it will form a parabola on the graph with the vertex at point (0,0) and points at (1,1), (-1,1), (2,4), (-2,4)......
What different information do you get from vertex form and quadratic equation in standard form?
The graph of a quadratic function is always a parabola. If you put the equation (or function) into vertex form, you can read off the coordinates of the vertex, and you know the shape and orientation (up/down) of the parabola.
What is the defenishon of vertex?
If you are referring to graphs of quadratic functions such as parabolas; the vertex is the highest or lowest point on the graph. In another field of math known as graph theory, the vertex has an entirely different meaning. There is refers to the fundamental unit of which the graph is composed. It is like a node.
When is it better to have the quadratic function in vertex form instead of standard form?
The quadratic function is better represented in vertex form when you need to identify the vertex of the parabola quickly, as it directly reveals the coordinates of the vertex ((h, k)). This form is particularly useful for graphing, as it allows you to see the maximum or minimum point of the function immediately. Additionally, if you're interested in transformations such as shifts and reflections, vertex form clearly outlines how the graph is altered.
What is the definition of a Vertex form of a quadratic function?
it is a vertices's form of a function known as Quadratic
Which way does the graph open when 'a' is positive?
When 'a' is positive in a quadratic function of the form (y = ax^2 + bx + c), the graph opens upwards. This means the vertex of the parabola is the lowest point on the graph, and as you move away from the vertex in either direction, the values of (y) increase.
What is the equation for vertex form?
The vertex form for a quadratic equation is y=a(x-h)^2+k.
How do you convert vertex form to quadratic form?
Do you have a specific vertex fraction? vertex = -b/2a wuadratic = ax^ + bx + c
How do you look at a graph and tell what the quadratic function i?
To determine the quadratic function from a graph, first identify the shape of the parabola, which can open upwards or downwards. Look for key features such as the vertex, x-intercepts (roots), and y-intercept. The standard form of a quadratic function is ( f(x) = ax^2 + bx + c ), where ( a ) indicates the direction of the opening. By using the vertex and intercepts, you can derive the coefficients to write the specific equation of the quadratic function.
How can you use intercept form?
You can use intercept form to graph and write quadratic functions. y=a(x-p)(x-q) You can also use intercept form to graph and write cubic functions. y=a(x-p)(x-q)(x-r)
What are the benefits of writing a quadratic equation in vertex form and the benefits of writing a quadratic equation in standard form Name specific methods you can use while working with one form or?
Writing a quadratic equation in vertex form, ( y = a(x-h)^2 + k ), highlights the vertex of the parabola, making it easier to graph and identify key features like the maximum or minimum value. In contrast, standard form, ( y = ax^2 + bx + c ), is useful for quickly determining the y-intercept and applying the quadratic formula for finding roots. When working with vertex form, methods like completing the square can be employed to convert from standard form, while factoring or using the quadratic formula can be more straightforward when in standard form. Each form serves specific purposes depending on the analysis needed.
In the vertex form of a quadratic function y equals a the quantity of x-b squared plus c what does the b tell you about the graph?
The standard form of the quadratic function in (x - b)2 + c, has a vertex of (b, c). Thus, b is the units shifted to the right of the y-axis, and c is the units shifted above the x-axis.
Why is it better to have the quadratic function in vertex form instead of standard form?
If you want to graph the function, it is quite easy: y=a(x-h)2-k . . . you can plot the vertex (h,k); the 'a' tells you how wide or narrow the u-shape is, and whether it opens up or down.
