x(3x+5)-4(3x+5)=0

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Solution for x(3x+5)-4(3x+5)=0 equation: 


Simplifying
x(3x + 5) + -4(3x + 5) = 0

Reorder the terms:
x(5 + 3x) + -4(3x + 5) = 0
(5 * x + 3x * x) + -4(3x + 5) = 0
(5x + 3x2) + -4(3x + 5) = 0

Reorder the terms:
5x + 3x2 + -4(5 + 3x) = 0
5x + 3x2 + (5 * -4 + 3x * -4) = 0
5x + 3x2 + (-20 + -12x) = 0

Reorder the terms:
-20 + 5x + -12x + 3x2 = 0

Combine like terms: 5x + -12x = -7x
-20 + -7x + 3x2 = 0

Solving
-20 + -7x + 3x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-5 + -3x)(4 + -1x) = 0


Subproblem 1
Set the factor '(-5 + -3x)' equal to zero and attempt to solve:

Simplifying
-5 + -3x = 0

Solving
-5 + -3x = 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 + -3x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -3x = 0 + 5
-3x = 0 + 5

Combine like terms: 0 + 5 = 5
-3x = 5

Divide each side by '-3'.
x = -1.666666667

Simplifying
x = -1.666666667

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 = {-1.666666667, 4}

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