84=(x+3)(x-2)

Solution for 84=(x+3)(x-2) equation:

Simplifying
84 = (x + 3)(x + -2)

Reorder the terms:
84 = (3 + x)(x + -2)

Reorder the terms:
84 = (3 + x)(-2 + x)

Multiply (3 + x) * (-2 + x)
84 = (3(-2 + x) + x(-2 + x))
84 = ((-2 * 3 + x * 3) + x(-2 + x))
84 = ((-6 + 3x) + x(-2 + x))
84 = (-6 + 3x + (-2 * x + x * x))
84 = (-6 + 3x + (-2x + x2))

Combine like terms: 3x + -2x = 1x
84 = (-6 + 1x + x2)

Solving
84 = -6 + 1x + x2

Solving for variable 'x'.

Combine like terms: 84 + 6 = 90
90 + -1x + -1x2 = -6 + 1x + x2 + 6 + -1x + -1x2

Reorder the terms:
90 + -1x + -1x2 = -6 + 6 + 1x + -1x + x2 + -1x2

Combine like terms: -6 + 6 = 0
90 + -1x + -1x2 = 0 + 1x + -1x + x2 + -1x2
90 + -1x + -1x2 = 1x + -1x + x2 + -1x2

Combine like terms: 1x + -1x = 0
90 + -1x + -1x2 = 0 + x2 + -1x2
90 + -1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
90 + -1x + -1x2 = 0

Factor a trinomial.
(9 + -1x)(10 + x) = 0

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 '(10 + x)' equal to zero and attempt to solve:

Simplifying
10 + x = 0

Solving
10 + x = 0

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

Add '-10' to each side of the equation.
10 + -10 + x = 0 + -10

Combine like terms: 10 + -10 = 0
0 + x = 0 + -10
x = 0 + -10

Combine like terms: 0 + -10 = -10
x = -10

Simplifying
x = -10
Solution
x = {9, -10}