(x+8)(x-4)=x^2+20

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Solution for (x+8)(x-4)=x^2+20 equation:


Simplifying
(x + 8)(x + -4) = x2 + 20

Reorder the terms:
(8 + x)(x + -4) = x2 + 20

Reorder the terms:
(8 + x)(-4 + x) = x2 + 20

Multiply (8 + x) * (-4 + x)
(8(-4 + x) + x(-4 + x)) = x2 + 20
((-4 * 8 + x * 8) + x(-4 + x)) = x2 + 20
((-32 + 8x) + x(-4 + x)) = x2 + 20
(-32 + 8x + (-4 * x + x * x)) = x2 + 20
(-32 + 8x + (-4x + x2)) = x2 + 20

Combine like terms: 8x + -4x = 4x
(-32 + 4x + x2) = x2 + 20

Reorder the terms:
-32 + 4x + x2 = 20 + x2

Add '-1x2' to each side of the equation.
-32 + 4x + x2 + -1x2 = 20 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-32 + 4x + 0 = 20 + x2 + -1x2
-32 + 4x = 20 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-32 + 4x = 20 + 0
-32 + 4x = 20

Solving
-32 + 4x = 20

Solving for variable 'x'.

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

Add '32' to each side of the equation.
-32 + 32 + 4x = 20 + 32

Combine like terms: -32 + 32 = 0
0 + 4x = 20 + 32
4x = 20 + 32

Combine like terms: 20 + 32 = 52
4x = 52

Divide each side by '4'.
x = 13

Simplifying
x = 13

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