x^2-3x-4=(x-4)(x+1)

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Solution for x^2-3x-4=(x-4)(x+1) equation:


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

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

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

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

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

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

Add '4' to each side of the equation.
-4 + -3x + 4 + x2 = -4 + -3x + 4 + x2

Reorder the terms:
-4 + 4 + -3x + x2 = -4 + -3x + 4 + x2

Combine like terms: -4 + 4 = 0
0 + -3x + x2 = -4 + -3x + 4 + x2
-3x + x2 = -4 + -3x + 4 + x2

Reorder the terms:
-3x + x2 = -4 + 4 + -3x + x2

Combine like terms: -4 + 4 = 0
-3x + x2 = 0 + -3x + x2
-3x + x2 = -3x + x2

Add '3x' to each side of the equation.
-3x + 3x + x2 = -3x + 3x + x2

Combine like terms: -3x + 3x = 0
0 + x2 = -3x + 3x + x2
x2 = -3x + 3x + x2

Combine like terms: -3x + 3x = 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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