x(20x-36)=72

Solution for x(20x-36)=72 equation:

Simplifying
x(20x + -36) = 72

Reorder the terms:
x(-36 + 20x) = 72
(-36 * x + 20x * x) = 72
(-36x + 20x2) = 72

Solving
-36x + 20x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + -36x + 20x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + -36x + 20x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-18 + -9x + 5x2) = 0

Factor a trinomial.
4((-6 + -5x)(3 + -1x)) = 0

Ignore the factor 4.
Subproblem 1
Set the factor '(-6 + -5x)' equal to zero and attempt to solve:

Simplifying
-6 + -5x = 0

Solving
-6 + -5x = 0

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

Add '6' to each side of the equation.
-6 + 6 + -5x = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -5x = 0 + 6
-5x = 0 + 6

Combine like terms: 0 + 6 = 6
-5x = 6

Divide each side by '-5'.
x = -1.2

Simplifying
x = -1.2
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 = {-1.2, 3}