12+(x-5)(x+5)=x(x+13)

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Solution for 12+(x-5)(x+5)=x(x+13) equation:


Simplifying
12 + (x + -5)(x + 5) = x(x + 13)

Reorder the terms:
12 + (-5 + x)(x + 5) = x(x + 13)

Reorder the terms:
12 + (-5 + x)(5 + x) = x(x + 13)

Multiply (-5 + x) * (5 + x)
12 + (-5(5 + x) + x(5 + x)) = x(x + 13)
12 + ((5 * -5 + x * -5) + x(5 + x)) = x(x + 13)
12 + ((-25 + -5x) + x(5 + x)) = x(x + 13)
12 + (-25 + -5x + (5 * x + x * x)) = x(x + 13)
12 + (-25 + -5x + (5x + x2)) = x(x + 13)

Combine like terms: -5x + 5x = 0
12 + (-25 + 0 + x2) = x(x + 13)
12 + (-25 + x2) = x(x + 13)

Combine like terms: 12 + -25 = -13
-13 + x2 = x(x + 13)

Reorder the terms:
-13 + x2 = x(13 + x)
-13 + x2 = (13 * x + x * x)
-13 + x2 = (13x + x2)

Add '-1x2' to each side of the equation.
-13 + x2 + -1x2 = 13x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-13 + 0 = 13x + x2 + -1x2
-13 = 13x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-13 = 13x + 0
-13 = 13x

Solving
-13 = 13x

Solving for variable 'x'.

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

Add '-13x' to each side of the equation.
-13 + -13x = 13x + -13x

Combine like terms: 13x + -13x = 0
-13 + -13x = 0

Add '13' to each side of the equation.
-13 + 13 + -13x = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -13x = 0 + 13
-13x = 0 + 13

Combine like terms: 0 + 13 = 13
-13x = 13

Divide each side by '-13'.
x = -1

Simplifying
x = -1

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