(x-1)(x+1)=8

Simple and best practice solution for (x-1)(x+1)=8 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for (x-1)(x+1)=8 equation:


Simplifying
(x + -1)(x + 1) = 8

Reorder the terms:
(-1 + x)(x + 1) = 8

Reorder the terms:
(-1 + x)(1 + x) = 8

Multiply (-1 + x) * (1 + x)
(-1(1 + x) + x(1 + x)) = 8
((1 * -1 + x * -1) + x(1 + x)) = 8
((-1 + -1x) + x(1 + x)) = 8
(-1 + -1x + (1 * x + x * x)) = 8
(-1 + -1x + (1x + x2)) = 8

Combine like terms: -1x + 1x = 0
(-1 + 0 + x2) = 8
(-1 + x2) = 8

Solving
-1 + x2 = 8

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + x2 = 8 + 1

Combine like terms: -1 + 1 = 0
0 + x2 = 8 + 1
x2 = 8 + 1

Combine like terms: 8 + 1 = 9
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

See similar equations:

| 4x-12000x^1/x^2=0 | | 8-3(1+4x)=89 | | 6x+3y=5x+15 | | 3(5x-1)(7y-6)= | | 2(2-x)(x^2-x-4)= | | 9x-12y=6 | | (-6x+7)-(8x-3)=y | | 5k-4y-6k+5y=0 | | -9(y-z)= | | (x+3)(x+a)(x+7)=x^3+15x^2+71x+105 | | 6Xwhenb=7 | | 6n-1=106 | | 4(5x-6)(7y-3x)= | | 5-3a-a=11 | | 8x-4+6x+15= | | 4x^2+3x^2=400 | | .15y+.02(y+8000)=1010 | | 12(-2x+3)=-2x | | 2x^2+16x=-26 | | 6x+90=360 | | 4(5x-8)(7y-3x)= | | 4t-6q+t+7q=0 | | 30=2L+2(8) | | 6n-1=180 | | 13-1/13 | | (6x-3)=(5x+4) | | 41=3v+11 | | d=(65)(7) | | x+5=200 | | 4=3y+y | | 3x-(3/2)(x-5)=15 | | X^3-x^2=163 |

Equations solver categories