x(x+4)=2x+15

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Solution for x(x+4)=2x+15 equation: 


Simplifying
x(x + 4) = 2x + 15

Reorder the terms:
x(4 + x) = 2x + 15
(4 * x + x * x) = 2x + 15
(4x + x2) = 2x + 15

Reorder the terms:
4x + x2 = 15 + 2x

Solving
4x + x2 = 15 + 2x

Solving for variable 'x'.

Reorder the terms:
-15 + 4x + -2x + x2 = 15 + 2x + -15 + -2x

Combine like terms: 4x + -2x = 2x
-15 + 2x + x2 = 15 + 2x + -15 + -2x

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

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

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

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


Subproblem 1
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

Subproblem 2
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
Solution
x = {-5, 3}

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