(x+4)(3x-15)=0

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Solution for (x+4)(3x-15)=0 equation: 


Simplifying
(x + 4)(3x + -15) = 0

Reorder the terms:
(4 + x)(3x + -15) = 0

Reorder the terms:
(4 + x)(-15 + 3x) = 0

Multiply (4 + x) * (-15 + 3x)
(4(-15 + 3x) + x(-15 + 3x)) = 0
((-15 * 4 + 3x * 4) + x(-15 + 3x)) = 0
((-60 + 12x) + x(-15 + 3x)) = 0
(-60 + 12x + (-15 * x + 3x * x)) = 0
(-60 + 12x + (-15x + 3x2)) = 0

Combine like terms: 12x + -15x = -3x
(-60 + -3x + 3x2) = 0

Solving
-60 + -3x + 3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-20 + -1x + x2) = 0

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

Ignore the factor 3.

Subproblem 1
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

Subproblem 2
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
Solution
x = {-4, 5}

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