Question 122567
x^2-6x-7=0

when he ask this question we equal the equation to zer0

then we try to find the roots for the equation

the roots means we solve the equation in this shape

(        )(         )=zero
so

(x-7)(x+1)=0  to make sure u can multiply the two pranticese u will get the same equation
then each brantic. = 0  so  x-7=0    so x=-7

                        and x+1=0  so x=-1