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

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


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

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

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

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

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

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

Add '-15' to each side of the equation.
15 + 5x + -15 + x2 = 15 + 8x + -15 + x2

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

Combine like terms: 15 + -15 = 0
0 + 5x + x2 = 15 + 8x + -15 + x2
5x + x2 = 15 + 8x + -15 + x2

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

Combine like terms: 15 + -15 = 0
5x + x2 = 0 + 8x + x2
5x + x2 = 8x + x2

Add '-1x2' to each side of the equation.
5x + x2 + -1x2 = 8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
5x + 0 = 8x + x2 + -1x2
5x = 8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
5x = 8x + 0
5x = 8x

Solving
5x = 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
5x + -8x = 8x + -8x

Combine like terms: 5x + -8x = -3x
-3x = 8x + -8x

Combine like terms: 8x + -8x = 0
-3x = 0

Divide each side by '-3'.
x = 0

Simplifying
x = 0

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