(x+2)(x-1)=28

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Solution for (x+2)(x-1)=28 equation:


Simplifying
(x + 2)(x + -1) = 28

Reorder the terms:
(2 + x)(x + -1) = 28

Reorder the terms:
(2 + x)(-1 + x) = 28

Multiply (2 + x) * (-1 + x)
(2(-1 + x) + x(-1 + x)) = 28
((-1 * 2 + x * 2) + x(-1 + x)) = 28
((-2 + 2x) + x(-1 + x)) = 28
(-2 + 2x + (-1 * x + x * x)) = 28
(-2 + 2x + (-1x + x2)) = 28

Combine like terms: 2x + -1x = 1x
(-2 + 1x + x2) = 28

Solving
-2 + 1x + x2 = 28

Solving for variable 'x'.

Reorder the terms:
-2 + -28 + 1x + x2 = 28 + -28

Combine like terms: -2 + -28 = -30
-30 + 1x + x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-30 + 1x + x2 = 0

Factor a trinomial.
(-6 + -1x)(5 + -1x) = 0

Subproblem 1

Set the factor '(-6 + -1x)' equal to zero and attempt to solve: Simplifying -6 + -1x = 0 Solving -6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -1x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -1x = 0 + 6 -1x = 0 + 6 Combine like terms: 0 + 6 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-6, 5}

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