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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.

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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.


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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.


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