(x-5)(x+7)=x^2-9

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Solution for (x-5)(x+7)=x^2-9 equation:


Simplifying
(x + -5)(x + 7) = x2 + -9

Reorder the terms:
(-5 + x)(x + 7) = x2 + -9

Reorder the terms:
(-5 + x)(7 + x) = x2 + -9

Multiply (-5 + x) * (7 + x)
(-5(7 + x) + x(7 + x)) = x2 + -9
((7 * -5 + x * -5) + x(7 + x)) = x2 + -9
((-35 + -5x) + x(7 + x)) = x2 + -9
(-35 + -5x + (7 * x + x * x)) = x2 + -9
(-35 + -5x + (7x + x2)) = x2 + -9

Combine like terms: -5x + 7x = 2x
(-35 + 2x + x2) = x2 + -9

Reorder the terms:
-35 + 2x + x2 = -9 + x2

Add '-1x2' to each side of the equation.
-35 + 2x + x2 + -1x2 = -9 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-35 + 2x + 0 = -9 + x2 + -1x2
-35 + 2x = -9 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-35 + 2x = -9 + 0
-35 + 2x = -9

Solving
-35 + 2x = -9

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '35' to each side of the equation.
-35 + 35 + 2x = -9 + 35

Combine like terms: -35 + 35 = 0
0 + 2x = -9 + 35
2x = -9 + 35

Combine like terms: -9 + 35 = 26
2x = 26

Divide each side by '2'.
x = 13

Simplifying
x = 13

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