x(x-9)=(x-12)(x+4)

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Solution for x(x-9)=(x-12)(x+4) equation:


Simplifying
x(x + -9) = (x + -12)(x + 4)

Reorder the terms:
x(-9 + x) = (x + -12)(x + 4)
(-9 * x + x * x) = (x + -12)(x + 4)
(-9x + x2) = (x + -12)(x + 4)

Reorder the terms:
-9x + x2 = (-12 + x)(x + 4)

Reorder the terms:
-9x + x2 = (-12 + x)(4 + x)

Multiply (-12 + x) * (4 + x)
-9x + x2 = (-12(4 + x) + x(4 + x))
-9x + x2 = ((4 * -12 + x * -12) + x(4 + x))
-9x + x2 = ((-48 + -12x) + x(4 + x))
-9x + x2 = (-48 + -12x + (4 * x + x * x))
-9x + x2 = (-48 + -12x + (4x + x2))

Combine like terms: -12x + 4x = -8x
-9x + x2 = (-48 + -8x + x2)

Add '-1x2' to each side of the equation.
-9x + x2 + -1x2 = -48 + -8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-9x + 0 = -48 + -8x + x2 + -1x2
-9x = -48 + -8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-9x = -48 + -8x + 0
-9x = -48 + -8x

Solving
-9x = -48 + -8x

Solving for variable 'x'.

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

Add '8x' to each side of the equation.
-9x + 8x = -48 + -8x + 8x

Combine like terms: -9x + 8x = -1x
-1x = -48 + -8x + 8x

Combine like terms: -8x + 8x = 0
-1x = -48 + 0
-1x = -48

Divide each side by '-1'.
x = 48

Simplifying
x = 48

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