-18=(x+7)(x-4)

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Solution for -18=(x+7)(x-4) equation: 


Simplifying
-18 = (x + 7)(x + -4)

Reorder the terms:
-18 = (7 + x)(x + -4)

Reorder the terms:
-18 = (7 + x)(-4 + x)

Multiply (7 + x) * (-4 + x)
-18 = (7(-4 + x) + x(-4 + x))
-18 = ((-4 * 7 + x * 7) + x(-4 + x))
-18 = ((-28 + 7x) + x(-4 + x))
-18 = (-28 + 7x + (-4 * x + x * x))
-18 = (-28 + 7x + (-4x + x2))

Combine like terms: 7x + -4x = 3x
-18 = (-28 + 3x + x2)

Solving
-18 = -28 + 3x + x2

Solving for variable 'x'.

Combine like terms: -18 + 28 = 10
10 + -3x + -1x2 = -28 + 3x + x2 + 28 + -3x + -1x2

Reorder the terms:
10 + -3x + -1x2 = -28 + 28 + 3x + -3x + x2 + -1x2

Combine like terms: -28 + 28 = 0
10 + -3x + -1x2 = 0 + 3x + -3x + x2 + -1x2
10 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
10 + -3x + -1x2 = 0 + x2 + -1x2
10 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
10 + -3x + -1x2 = 0

Factor a trinomial.
(2 + -1x)(5 + x) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(5 + x)' equal to zero and attempt to solve:

Simplifying
5 + x = 0

Solving
5 + x = 0

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

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

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

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

Simplifying
x = -5
Solution
x = {2, -5}

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