(5x+20)(x-3)=0

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Solution for (5x+20)(x-3)=0 equation:


Simplifying
(5x + 20)(x + -3) = 0

Reorder the terms:
(20 + 5x)(x + -3) = 0

Reorder the terms:
(20 + 5x)(-3 + x) = 0

Multiply (20 + 5x) * (-3 + x)
(20(-3 + x) + 5x * (-3 + x)) = 0
((-3 * 20 + x * 20) + 5x * (-3 + x)) = 0
((-60 + 20x) + 5x * (-3 + x)) = 0
(-60 + 20x + (-3 * 5x + x * 5x)) = 0
(-60 + 20x + (-15x + 5x2)) = 0

Combine like terms: 20x + -15x = 5x
(-60 + 5x + 5x2) = 0

Solving
-60 + 5x + 5x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '5'.
5(-12 + x + x2) = 0

Factor a trinomial.
5((-4 + -1x)(3 + -1x)) = 0

Ignore the factor 5.

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-4, 3}

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