x^2+x-20=(x+4)(x-5)

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Solution for x^2+x-20=(x+4)(x-5) equation:


Simplifying
x2 + x + -20 = (x + 4)(x + -5)

Reorder the terms:
-20 + x + x2 = (x + 4)(x + -5)

Reorder the terms:
-20 + x + x2 = (4 + x)(x + -5)

Reorder the terms:
-20 + x + x2 = (4 + x)(-5 + x)

Multiply (4 + x) * (-5 + x)
-20 + x + x2 = (4(-5 + x) + x(-5 + x))
-20 + x + x2 = ((-5 * 4 + x * 4) + x(-5 + x))
-20 + x + x2 = ((-20 + 4x) + x(-5 + x))
-20 + x + x2 = (-20 + 4x + (-5 * x + x * x))
-20 + x + x2 = (-20 + 4x + (-5x + x2))

Combine like terms: 4x + -5x = -1x
-20 + x + x2 = (-20 + -1x + x2)

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

Reorder the terms:
-20 + 20 + x + x2 = -20 + -1x + 20 + x2

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

Reorder the terms:
x + x2 = -20 + 20 + -1x + x2

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

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

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

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

Solving
x = -1x

Solving for variable 'x'.

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

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

Combine like terms: x + x = 2x
2x = -1x + x

Combine like terms: -1x + x = 0
2x = 0

Divide each side by '2'.
x = 0

Simplifying
x = 0

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