x^2+9x+20=(x+5)(x-4)

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Solution for x^2+9x+20=(x+5)(x-4) equation:


Simplifying
x2 + 9x + 20 = (x + 5)(x + -4)

Reorder the terms:
20 + 9x + x2 = (x + 5)(x + -4)

Reorder the terms:
20 + 9x + x2 = (5 + x)(x + -4)

Reorder the terms:
20 + 9x + x2 = (5 + x)(-4 + x)

Multiply (5 + x) * (-4 + x)
20 + 9x + x2 = (5(-4 + x) + x(-4 + x))
20 + 9x + x2 = ((-4 * 5 + x * 5) + x(-4 + x))
20 + 9x + x2 = ((-20 + 5x) + x(-4 + x))
20 + 9x + x2 = (-20 + 5x + (-4 * x + x * x))
20 + 9x + x2 = (-20 + 5x + (-4x + x2))

Combine like terms: 5x + -4x = 1x
20 + 9x + x2 = (-20 + 1x + x2)

Add '-1x2' to each side of the equation.
20 + 9x + x2 + -1x2 = -20 + 1x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
20 + 9x + 0 = -20 + 1x + x2 + -1x2
20 + 9x = -20 + 1x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
20 + 9x = -20 + 1x + 0
20 + 9x = -20 + 1x

Solving
20 + 9x = -20 + 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
20 + 9x + -1x = -20 + 1x + -1x

Combine like terms: 9x + -1x = 8x
20 + 8x = -20 + 1x + -1x

Combine like terms: 1x + -1x = 0
20 + 8x = -20 + 0
20 + 8x = -20

Add '-20' to each side of the equation.
20 + -20 + 8x = -20 + -20

Combine like terms: 20 + -20 = 0
0 + 8x = -20 + -20
8x = -20 + -20

Combine like terms: -20 + -20 = -40
8x = -40

Divide each side by '8'.
x = -5

Simplifying
x = -5

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