3x+15=(X+1)(X-1)

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Solution for 3x+15=(X+1)(X-1) equation: 


Simplifying
3x + 15 = (X + 1)(X + -1)

Reorder the terms:
15 + 3x = (X + 1)(X + -1)

Reorder the terms:
15 + 3x = (1 + X)(X + -1)

Reorder the terms:
15 + 3x = (1 + X)(-1 + X)

Multiply (1 + X) * (-1 + X)
15 + 3x = (1(-1 + X) + X(-1 + X))
15 + 3x = ((-1 * 1 + X * 1) + X(-1 + X))
15 + 3x = ((-1 + 1X) + X(-1 + X))
15 + 3x = (-1 + 1X + (-1 * X + X * X))
15 + 3x = (-1 + 1X + (-1X + X2))

Combine like terms: 1X + -1X = 0
15 + 3x = (-1 + 0 + X2)
15 + 3x = (-1 + X2)

Solving
15 + 3x = -1 + X2

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 3x = -1 + -15 + X2

Combine like terms: 15 + -15 = 0
0 + 3x = -1 + -15 + X2
3x = -1 + -15 + X2

Combine like terms: -1 + -15 = -16
3x = -16 + X2

Divide each side by '3'.
x = -5.333333333 + 0.3333333333X2

Simplifying
x = -5.333333333 + 0.3333333333X2

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