3x^2+15x=72

Solution for 3x^2+15x=72 equation:

Simplifying
3x2 + 15x = 72

Reorder the terms:
15x + 3x2 = 72

Solving
15x + 3x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + 15x + 3x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + 15x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-24 + 5x + x2) = 0

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

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

Simplifying
-8 + -1x = 0

Solving
-8 + -1x = 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 + -1x = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1x = 0 + 8
-1x = 0 + 8

Combine like terms: 0 + 8 = 8
-1x = 8

Divide each side by '-1'.
x = -8

Simplifying
x = -8
Subproblem 2
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
Solution
x = {-8, 3}