(x)(28+4x)=72

Solution for (x)(28+4x)=72 equation:

Simplifying
(x)(28 + 4x) = 72
(28 * x + 4x * x) = 72
(28x + 4x2) = 72

Solving
28x + 4x2 = 72

Solving for variable 'x'.

Reorder the terms:
-72 + 28x + 4x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-72 + 28x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-18 + 7x + x2) = 0

Factor a trinomial.
4((-9 + -1x)(2 + -1x)) = 0

Ignore the factor 4.
Subproblem 1
Set the factor '(-9 + -1x)' equal to zero and attempt to solve:

Simplifying
-9 + -1x = 0

Solving
-9 + -1x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -1x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = 0 + 9
-1x = 0 + 9

Combine like terms: 0 + 9 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9
Subproblem 2
Set the factor '(2 + -1x)' equal to zero and attempt to solve:

Simplifying
2 + -1x = 0

Solving
2 + -1x = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1x = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1x = 0 + -2
-1x = 0 + -2

Combine like terms: 0 + -2 = -2
-1x = -2

Divide each side by '-1'.
x = 2

Simplifying
x = 2
Solution
x = {-9, 2}