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

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

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

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