(x-7)(x+15)=0

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Solution for (x-7)(x+15)=0 equation:


Simplifying
(x + -7)(x + 15) = 0

Reorder the terms:
(-7 + x)(x + 15) = 0

Reorder the terms:
(-7 + x)(15 + x) = 0

Multiply (-7 + x) * (15 + x)
(-7(15 + x) + x(15 + x)) = 0
((15 * -7 + x * -7) + x(15 + x)) = 0
((-105 + -7x) + x(15 + x)) = 0
(-105 + -7x + (15 * x + x * x)) = 0
(-105 + -7x + (15x + x2)) = 0

Combine like terms: -7x + 15x = 8x
(-105 + 8x + x2) = 0

Solving
-105 + 8x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-15 + -1x)(7 + -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 '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {-15, 7}

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