4+x(x-5)=28

Solution for 4+x(x-5)=28 equation:

Simplifying
4 + x(x + -5) = 28

Reorder the terms:
4 + x(-5 + x) = 28
4 + (-5 * x + x * x) = 28
4 + (-5x + x2) = 28

Solving
4 + -5x + x2 = 28

Solving for variable 'x'.

Reorder the terms:
4 + -28 + -5x + x2 = 28 + -28

Combine like terms: 4 + -28 = -24
-24 + -5x + x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-24 + -5x + x2 = 0

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

Subproblem 1
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
Subproblem 2
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
Solution
x = {-3, 8}