x(x+1)=(x-1)(x+1)

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



x(x+1)=(x-1)(x+1)

We move all terms to the left:

x(x+1)-((x-1)(x+1))=0

We use the square of the difference formula

x^2+x(x+1)+1=0

We multiply parentheses

x^2+x^2+x+1=0

We add all the numbers together, and all the variables

2x^2+x+1=0

a = 2; b = 1; c = +1;
Δ = b2-4ac
Δ = 12-4·2·1
Δ = -7
Delta is less than zero, so there is no solution for the equation

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