x^2-x-12=(x+3)(x-4)

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Solution for x^2-x-12=(x+3)(x-4) equation:


Simplifying
x2 + -1x + -12 = (x + 3)(x + -4)

Reorder the terms:
-12 + -1x + x2 = (x + 3)(x + -4)

Reorder the terms:
-12 + -1x + x2 = (3 + x)(x + -4)

Reorder the terms:
-12 + -1x + x2 = (3 + x)(-4 + x)

Multiply (3 + x) * (-4 + x)
-12 + -1x + x2 = (3(-4 + x) + x(-4 + x))
-12 + -1x + x2 = ((-4 * 3 + x * 3) + x(-4 + x))
-12 + -1x + x2 = ((-12 + 3x) + x(-4 + x))
-12 + -1x + x2 = (-12 + 3x + (-4 * x + x * x))
-12 + -1x + x2 = (-12 + 3x + (-4x + x2))

Combine like terms: 3x + -4x = -1x
-12 + -1x + x2 = (-12 + -1x + x2)

Add '12' to each side of the equation.
-12 + -1x + 12 + x2 = -12 + -1x + 12 + x2

Reorder the terms:
-12 + 12 + -1x + x2 = -12 + -1x + 12 + x2

Combine like terms: -12 + 12 = 0
0 + -1x + x2 = -12 + -1x + 12 + x2
-1x + x2 = -12 + -1x + 12 + x2

Reorder the terms:
-1x + x2 = -12 + 12 + -1x + x2

Combine like terms: -12 + 12 = 0
-1x + x2 = 0 + -1x + x2
-1x + x2 = -1x + x2

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

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

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

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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