Question 740734: -4x = -2x2 + 30
Answer by lenny460(1073)   (Show Source):
You can put this solution on YOUR website! -4x = -2x2 + 30
Add +4x to each side of the equation.
-4x + 4x = -2x^2 + 30 + 4x
-4x + 4x = 0
Therefore:
-2x^2 + 30 + 4x = 0
Rearrange the quadratic equation:
-2x^2 + 4x + 30 = -
Divide each item by -2
-2x^2/-2 = x^2
4x/-2 = -2x
30/-2 = -15
Now we have:
x^2 - 2x - 15 = 0
Factor:
(x + 3)(x - 5) = 0
Answer:
x = -3, 5
Lennox Obuong
Algebra Tutor
Nairobi, Kenya
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