0
-31
Hulda Pouros
Wiki User
∙ 14y agox2 - 3x -28 = 0
move the constant
x2 - 3x = 28
take half of the x term (1.5), square it (2.25), and add to both sides
x2 - 3x + 2.25 = 2.25 + 28
The left side is now a perfect square, simplify
(x - 1.5)2 = 30.25
Taking the square root of both sides, you find that
x - 1.5 = ±5.5
So...
X1 = 1.5 + 5.5 = 7
X2 = 1.5 - 5.5 = -4
Add your answer:
Earn +20 pts
What mistake was made in this equation 3x plus 7 equals -4x plus 28 -x plus 7 equals 28 -x equals 21 x equals -21?
3x + 7 = -4x + 28 implies 7x + 7 = 28
What is the x in the equation -x2 plus 3x plus 2y?
This is only half of an equation. If -x^2 + 3x +2y = 0, then x^2 -3x = 2y and y = (x^2-3x)/2 Solving for x is the inverse, but difficult without a second equation.
What is x in this equation 3x plus 4 equals -11?
3x+4=-11 3x=-15 x=-5
What is X plus 7y equals 33 and 3x - 2y equals 7?
x + 7y = 33 multiply through by 3: 3x + 21y = 99 Subtract the second equation from the above equation: 23y = 92 So y = 4 Substituting this value of y in the first equation, x + 28 = 33 ie x = 5 The solution is (x,y) = (5,4)
What is X squared equals 3X?
It is a quadratic equation in X.
What is the answer to this equation 3x-1 equals 28?
3x - 1 = 28 3x = 29 x = 29/3 x= (approximately) 9.67
Write the quadratic equation in factored formx2 plus 3x-28?
x2 + 3x - 28 = x2 + 7x - 4x - 28 = x(x + 7) - 4(x + 7) = (x + 7)(x - 4)
What is the solution to this equation 3x and ndash 7 plus 4x 28?
If you mean: 3x -7 +4x = 28 then the value of x works out as 5
What mistake was made in this equation 3x plus 7 equals -4x plus 28 -x plus 7 equals 28 -x equals 21 x equals -21?
3x + 7 = -4x + 28 implies 7x + 7 = 28
X² -3x - 28 equals?
-31
What is the x in the equation -x2 plus 3x plus 2y?
This is only half of an equation. If -x^2 + 3x +2y = 0, then x^2 -3x = 2y and y = (x^2-3x)/2 Solving for x is the inverse, but difficult without a second equation.
When x is -5 what is the value of 2x cubed - 3x?
If the equation is (2x)^3-3x, then the answer is -985. However, if the equation if 2(x)^3-3x, then the answer is -235.
Choose the quadratic equation with a leading coefficient of 1 that has as solutions -4 and 7?
x^2-3x-28=0...................
What is the equation of the line in point-slope form that passes through the points 9 1 and 4 16?
Points: (9, 1) and (4, 16) Slope: (1-16)/(9-4) = -3 Equation: y-1 = -3(x-9) => y = -3x+28 Equation: y-16 = -3(x-4) => y = -3x+28
What is the equation of the line in point-slope form that passes through the points (-1 7) and (-2 3)?
Points: (9, 1) and (4, 16) Slope: (1-16)/(9-4) = -3 Equation: y-1 = -3(x-9) => y = -3x+28 Equation: y-16 = -3(x-4) => y = -3x+28
What is the equation for 3x equals x divided by 6?
0.5
What is x in this equation 3x plus 4 equals -11?
3x+4=-11 3x=-15 x=-5
