(4x+8)(5x-20)=0

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Solution for (4x+8)(5x-20)=0 equation:


Simplifying
(4x + 8)(5x + -20) = 0

Reorder the terms:
(8 + 4x)(5x + -20) = 0

Reorder the terms:
(8 + 4x)(-20 + 5x) = 0

Multiply (8 + 4x) * (-20 + 5x)
(8(-20 + 5x) + 4x * (-20 + 5x)) = 0
((-20 * 8 + 5x * 8) + 4x * (-20 + 5x)) = 0
((-160 + 40x) + 4x * (-20 + 5x)) = 0
(-160 + 40x + (-20 * 4x + 5x * 4x)) = 0
(-160 + 40x + (-80x + 20x2)) = 0

Combine like terms: 40x + -80x = -40x
(-160 + -40x + 20x2) = 0

Solving
-160 + -40x + 20x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '20'.
20(-8 + -2x + x2) = 0

Factor a trinomial.
20((-2 + -1x)(4 + -1x)) = 0

Ignore the factor 20.

Subproblem 1

Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {-2, 4}

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