2x^2+2x=x^2-1

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


Simplifying
2x2 + 2x = x2 + -1

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

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

Solving
2x + 2x2 = -1 + x2

Solving for variable 'x'.

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

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

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

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

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

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

Subproblem 1

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

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 = {-1, -1}

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