x(x+2)=3(x+4)

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Solution for x(x+2)=3(x+4) equation: 


Simplifying
x(x + 2) = 3(x + 4)

Reorder the terms:
x(2 + x) = 3(x + 4)
(2 * x + x * x) = 3(x + 4)
(2x + x2) = 3(x + 4)

Reorder the terms:
2x + x2 = 3(4 + x)
2x + x2 = (4 * 3 + x * 3)
2x + x2 = (12 + 3x)

Solving
2x + x2 = 12 + 3x

Solving for variable 'x'.

Reorder the terms:
-12 + 2x + -3x + x2 = 12 + 3x + -12 + -3x

Combine like terms: 2x + -3x = -1x
-12 + -1x + x2 = 12 + 3x + -12 + -3x

Reorder the terms:
-12 + -1x + x2 = 12 + -12 + 3x + -3x

Combine like terms: 12 + -12 = 0
-12 + -1x + x2 = 0 + 3x + -3x
-12 + -1x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-12 + -1x + x2 = 0

Factor a trinomial.
(-3 + -1x)(4 + -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 '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-3, 4}

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