x^2-4x-15=3x+3

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Solution for x^2-4x-15=3x+3 equation: 


Simplifying
x2 + -4x + -15 = 3x + 3

Reorder the terms:
-15 + -4x + x2 = 3x + 3

Reorder the terms:
-15 + -4x + x2 = 3 + 3x

Solving
-15 + -4x + x2 = 3 + 3x

Solving for variable 'x'.

Reorder the terms:
-15 + -3 + -4x + -3x + x2 = 3 + 3x + -3 + -3x

Combine like terms: -15 + -3 = -18
-18 + -4x + -3x + x2 = 3 + 3x + -3 + -3x

Combine like terms: -4x + -3x = -7x
-18 + -7x + x2 = 3 + 3x + -3 + -3x

Reorder the terms:
-18 + -7x + x2 = 3 + -3 + 3x + -3x

Combine like terms: 3 + -3 = 0
-18 + -7x + x2 = 0 + 3x + -3x
-18 + -7x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-18 + -7x + x2 = 0

Factor a trinomial.
(-2 + -1x)(9 + -1x) = 0


Subproblem 1
Set the factor '(-2 + -1x)' equal to zero and attempt to solve:

Simplifying
-2 + -1x = 0

Solving
-2 + -1x = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1x = 0 + 2

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

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

Divide each side by '-1'.
x = -2

Simplifying
x = -2

Subproblem 2
Set the factor '(9 + -1x)' equal to zero and attempt to solve:

Simplifying
9 + -1x = 0

Solving
9 + -1x = 0

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

Add '-9' to each side of the equation.
9 + -9 + -1x = 0 + -9

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

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

Divide each side by '-1'.
x = 9

Simplifying
x = 9
Solution
x = {-2, 9}

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