(x+15)(x-9)=0

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Solution for (x+15)(x-9)=0 equation:


Simplifying
(x + 15)(x + -9) = 0

Reorder the terms:
(15 + x)(x + -9) = 0

Reorder the terms:
(15 + x)(-9 + x) = 0

Multiply (15 + x) * (-9 + x)
(15(-9 + x) + x(-9 + x)) = 0
((-9 * 15 + x * 15) + x(-9 + x)) = 0
((-135 + 15x) + x(-9 + x)) = 0
(-135 + 15x + (-9 * x + x * x)) = 0
(-135 + 15x + (-9x + x2)) = 0

Combine like terms: 15x + -9x = 6x
(-135 + 6x + x2) = 0

Solving
-135 + 6x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-15 + -1x)(9 + -1x) = 0

Subproblem 1

Set the factor '(-15 + -1x)' equal to zero and attempt to solve: Simplifying -15 + -1x = 0 Solving -15 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1x = 0 + 15 -1x = 0 + 15 Combine like terms: 0 + 15 = 15 -1x = 15 Divide each side by '-1'. x = -15 Simplifying x = -15

Subproblem 2

Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9

Solution

x = {-15, 9}

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