-5x(x+4)=15

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Solution for -5x(x+4)=15 equation:


Simplifying
-5x(x + 4) = 15

Reorder the terms:
-5x(4 + x) = 15
(4 * -5x + x * -5x) = 15
(-20x + -5x2) = 15

Solving
-20x + -5x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -20x + -5x2 = 15 + -15

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

Factor out the Greatest Common Factor (GCF), '-5'.
-5(3 + 4x + x2) = 0

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

Ignore the factor -5.

Subproblem 1

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 2

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

Solution

x = {-3, -1}

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