3x(x-3)=4x+56

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Solution for 3x(x-3)=4x+56 equation: 


Simplifying
3x(x + -3) = 4x + 56

Reorder the terms:
3x(-3 + x) = 4x + 56
(-3 * 3x + x * 3x) = 4x + 56
(-9x + 3x2) = 4x + 56

Reorder the terms:
-9x + 3x2 = 56 + 4x

Solving
-9x + 3x2 = 56 + 4x

Solving for variable 'x'.

Reorder the terms:
-56 + -9x + -4x + 3x2 = 56 + 4x + -56 + -4x

Combine like terms: -9x + -4x = -13x
-56 + -13x + 3x2 = 56 + 4x + -56 + -4x

Reorder the terms:
-56 + -13x + 3x2 = 56 + -56 + 4x + -4x

Combine like terms: 56 + -56 = 0
-56 + -13x + 3x2 = 0 + 4x + -4x
-56 + -13x + 3x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-56 + -13x + 3x2 = 0

Factor a trinomial.
(-8 + -3x)(7 + -1x) = 0


Subproblem 1
Set the factor '(-8 + -3x)' equal to zero and attempt to solve:

Simplifying
-8 + -3x = 0

Solving
-8 + -3x = 0

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

Add '8' to each side of the equation.
-8 + 8 + -3x = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -3x = 0 + 8
-3x = 0 + 8

Combine like terms: 0 + 8 = 8
-3x = 8

Divide each side by '-3'.
x = -2.666666667

Simplifying
x = -2.666666667

Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {-2.666666667, 7}

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