(x-9)(x+7)=

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Solution for (x-9)(x+7)= equation:


Simplifying
(x + -9)(x + 7) = 0

Reorder the terms:
(-9 + x)(x + 7) = 0

Reorder the terms:
(-9 + x)(7 + x) = 0

Multiply (-9 + x) * (7 + x)
(-9(7 + x) + x(7 + x)) = 0
((7 * -9 + x * -9) + x(7 + x)) = 0
((-63 + -9x) + x(7 + x)) = 0
(-63 + -9x + (7 * x + x * x)) = 0
(-63 + -9x + (7x + x2)) = 0

Combine like terms: -9x + 7x = -2x
(-63 + -2x + x2) = 0

Solving
-63 + -2x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -1x)(9 + -1x) = 0

Subproblem 1

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

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 = {-7, 9}

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