3x(x+5)=4x+20

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Solution for 3x(x+5)=4x+20 equation: 


Simplifying
3x(x + 5) = 4x + 20

Reorder the terms:
3x(5 + x) = 4x + 20
(5 * 3x + x * 3x) = 4x + 20
(15x + 3x2) = 4x + 20

Reorder the terms:
15x + 3x2 = 20 + 4x

Solving
15x + 3x2 = 20 + 4x

Solving for variable 'x'.

Reorder the terms:
-20 + 15x + -4x + 3x2 = 20 + 4x + -20 + -4x

Combine like terms: 15x + -4x = 11x
-20 + 11x + 3x2 = 20 + 4x + -20 + -4x

Reorder the terms:
-20 + 11x + 3x2 = 20 + -20 + 4x + -4x

Combine like terms: 20 + -20 = 0
-20 + 11x + 3x2 = 0 + 4x + -4x
-20 + 11x + 3x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-20 + 11x + 3x2 = 0

Factor a trinomial.
(-5 + -1x)(4 + -3x) = 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 '(4 + -3x)' equal to zero and attempt to solve:

Simplifying
4 + -3x = 0

Solving
4 + -3x = 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 + -3x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -3x = 0 + -4
-3x = 0 + -4

Combine like terms: 0 + -4 = -4
-3x = -4

Divide each side by '-3'.
x = 1.333333333

Simplifying
x = 1.333333333
Solution
x = {-5, 1.333333333}

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