x(x-4)-4=x^2-16

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Solution for x(x-4)-4=x^2-16 equation:


Simplifying
x(x + -4) + -4 = x2 + -16

Reorder the terms:
x(-4 + x) + -4 = x2 + -16
(-4 * x + x * x) + -4 = x2 + -16
(-4x + x2) + -4 = x2 + -16

Reorder the terms:
-4 + -4x + x2 = x2 + -16

Reorder the terms:
-4 + -4x + x2 = -16 + x2

Add '-1x2' to each side of the equation.
-4 + -4x + x2 + -1x2 = -16 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-4 + -4x + 0 = -16 + x2 + -1x2
-4 + -4x = -16 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-4 + -4x = -16 + 0
-4 + -4x = -16

Solving
-4 + -4x = -16

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + -4x = -16 + 4

Combine like terms: -4 + 4 = 0
0 + -4x = -16 + 4
-4x = -16 + 4

Combine like terms: -16 + 4 = -12
-4x = -12

Divide each side by '-4'.
x = 3

Simplifying
x = 3

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