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

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


Simplifying
x2 + x + -1 = (2x + 1)(x + 2)

Reorder the terms:
-1 + x + x2 = (2x + 1)(x + 2)

Reorder the terms:
-1 + x + x2 = (1 + 2x)(x + 2)

Reorder the terms:
-1 + x + x2 = (1 + 2x)(2 + x)

Multiply (1 + 2x) * (2 + x)
-1 + x + x2 = (1(2 + x) + 2x * (2 + x))
-1 + x + x2 = ((2 * 1 + x * 1) + 2x * (2 + x))
-1 + x + x2 = ((2 + 1x) + 2x * (2 + x))
-1 + x + x2 = (2 + 1x + (2 * 2x + x * 2x))
-1 + x + x2 = (2 + 1x + (4x + 2x2))

Combine like terms: 1x + 4x = 5x
-1 + x + x2 = (2 + 5x + 2x2)

Solving
-1 + x + x2 = 2 + 5x + 2x2

Solving for variable 'x'.

Reorder the terms:
-1 + -2 + x + -5x + x2 + -2x2 = 2 + 5x + 2x2 + -2 + -5x + -2x2

Combine like terms: -1 + -2 = -3
-3 + x + -5x + x2 + -2x2 = 2 + 5x + 2x2 + -2 + -5x + -2x2

Combine like terms: x + -5x = -4x
-3 + -4x + x2 + -2x2 = 2 + 5x + 2x2 + -2 + -5x + -2x2

Combine like terms: x2 + -2x2 = -1x2
-3 + -4x + -1x2 = 2 + 5x + 2x2 + -2 + -5x + -2x2

Reorder the terms:
-3 + -4x + -1x2 = 2 + -2 + 5x + -5x + 2x2 + -2x2

Combine like terms: 2 + -2 = 0
-3 + -4x + -1x2 = 0 + 5x + -5x + 2x2 + -2x2
-3 + -4x + -1x2 = 5x + -5x + 2x2 + -2x2

Combine like terms: 5x + -5x = 0
-3 + -4x + -1x2 = 0 + 2x2 + -2x2
-3 + -4x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-3 + -4x + -1x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(3 + 4x + x2) = 0

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

Ignore the factor -1.

Subproblem 1

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Subproblem 2

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

Solution

x = {-3, -1}

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