(-x-5)(3x+9)=0

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Solution for (-x-5)(3x+9)=0 equation:


Simplifying
(-1x + -5)(3x + 9) = 0

Reorder the terms:
(-5 + -1x)(3x + 9) = 0

Reorder the terms:
(-5 + -1x)(9 + 3x) = 0

Multiply (-5 + -1x) * (9 + 3x)
(-5(9 + 3x) + -1x * (9 + 3x)) = 0
((9 * -5 + 3x * -5) + -1x * (9 + 3x)) = 0
((-45 + -15x) + -1x * (9 + 3x)) = 0
(-45 + -15x + (9 * -1x + 3x * -1x)) = 0
(-45 + -15x + (-9x + -3x2)) = 0

Combine like terms: -15x + -9x = -24x
(-45 + -24x + -3x2) = 0

Solving
-45 + -24x + -3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-3'.
-3(15 + 8x + x2) = 0

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

Ignore the factor -3.

Subproblem 1

Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Subproblem 2

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

Solution

x = {-5, -3}

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