x^2+x=3x+15

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


Simplifying
x2 + x = 3x + 15

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

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

Solving
x + x2 = 15 + 3x

Solving for variable 'x'.

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

Combine like terms: x + -3x = -2x
-15 + -2x + x2 = 15 + 3x + -15 + -3x

Reorder the terms:
-15 + -2x + x2 = 15 + -15 + 3x + -3x

Combine like terms: 15 + -15 = 0
-15 + -2x + x2 = 0 + 3x + -3x
-15 + -2x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-15 + -2x + x2 = 0

Factor a trinomial.
(-3 + -1x)(5 + -1x) = 0


Subproblem 1
Set the factor '(-3 + -1x)' equal to zero and attempt to solve:

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1x = 0 + 3

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

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

Divide each side by '-1'.
x = -3

Simplifying
x = -3

Subproblem 2
Set the factor '(5 + -1x)' equal to zero and attempt to solve:

Simplifying
5 + -1x = 0

Solving
5 + -1x = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1x = 0 + -5

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

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

Divide each side by '-1'.
x = 5

Simplifying
x = 5
Solution
x = {-3, 5}

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