SOLUTION: -4x = -2x2 + 30

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
RELATED QUESTIONS
2x2-30 0 (answered by Alan3354)

2x3+2x2-4x -----------... (answered by jim_thompson5910)

The floor plan of a house is rectangular. The house's length is 2x � 10 and its width is... (answered by checkley77)

The floor plan of a house is rectangular. The house's length is 2x � 10 and its width is... (answered by vijay)

(7x � 0.6) � (-2x2 + 4x �... (answered by rfer)

2x2 (answered by Alan3354)

Multiply: (4x + 1)(2x2 + x + 1) (answered by stanbon)

Multiply: (4x + 1)(2x2 + 5x + 1) (answered by nerdybill)

3x2 + 4x + 3x2 - 4y (5x - 2y) - (4x + 8y) 3x3(2x2) (answered by funmath)