x^2-8x+15=(x-3)(x+5)

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Solution for x^2-8x+15=(x-3)(x+5) equation:


Simplifying
x2 + -8x + 15 = (x + -3)(x + 5)

Reorder the terms:
15 + -8x + x2 = (x + -3)(x + 5)

Reorder the terms:
15 + -8x + x2 = (-3 + x)(x + 5)

Reorder the terms:
15 + -8x + x2 = (-3 + x)(5 + x)

Multiply (-3 + x) * (5 + x)
15 + -8x + x2 = (-3(5 + x) + x(5 + x))
15 + -8x + x2 = ((5 * -3 + x * -3) + x(5 + x))
15 + -8x + x2 = ((-15 + -3x) + x(5 + x))
15 + -8x + x2 = (-15 + -3x + (5 * x + x * x))
15 + -8x + x2 = (-15 + -3x + (5x + x2))

Combine like terms: -3x + 5x = 2x
15 + -8x + x2 = (-15 + 2x + x2)

Add '-1x2' to each side of the equation.
15 + -8x + x2 + -1x2 = -15 + 2x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
15 + -8x + 0 = -15 + 2x + x2 + -1x2
15 + -8x = -15 + 2x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
15 + -8x = -15 + 2x + 0
15 + -8x = -15 + 2x

Solving
15 + -8x = -15 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
15 + -8x + -2x = -15 + 2x + -2x

Combine like terms: -8x + -2x = -10x
15 + -10x = -15 + 2x + -2x

Combine like terms: 2x + -2x = 0
15 + -10x = -15 + 0
15 + -10x = -15

Add '-15' to each side of the equation.
15 + -15 + -10x = -15 + -15

Combine like terms: 15 + -15 = 0
0 + -10x = -15 + -15
-10x = -15 + -15

Combine like terms: -15 + -15 = -30
-10x = -30

Divide each side by '-10'.
x = 3

Simplifying
x = 3

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