(x-30)(x+4)=0

Solution for (x-30)(x+4)=0 equation:

Simplifying
(x + -30)(x + 4) = 0

Reorder the terms:
(-30 + x)(x + 4) = 0

Reorder the terms:
(-30 + x)(4 + x) = 0

Multiply (-30 + x) * (4 + x)
(-30(4 + x) + x(4 + x)) = 0
((4 * -30 + x * -30) + x(4 + x)) = 0
((-120 + -30x) + x(4 + x)) = 0
(-120 + -30x + (4 * x + x * x)) = 0
(-120 + -30x + (4x + x2)) = 0

Combine like terms: -30x + 4x = -26x
(-120 + -26x + x2) = 0

Solving
-120 + -26x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-4 + -1x)(30 + -1x) = 0

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 '(30 + -1x)' equal to zero and attempt to solve:

Simplifying
30 + -1x = 0

Solving
30 + -1x = 0

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

Add '-30' to each side of the equation.
30 + -30 + -1x = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -1x = 0 + -30
-1x = 0 + -30

Combine like terms: 0 + -30 = -30
-1x = -30

Divide each side by '-1'.
x = 30

Simplifying
x = 30
Solution
x = {-4, 30}