Question

1. (x - 1) (x + 1) = 8​

Answer 1

Step-by-step explanation:

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

x2+x-x-1=8

x2-1=8

Answer 2

Answer:

x = 3

Step-by-step explanation:

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

or, x^2 - 1^2 = 8

or, x^2 - 1 = 8

or, x^2 = 8 + 1

or, x^2 = 9

or, x = square root of 9

or, x = 3