Question

Anybody plz for gods sake help me
Give ans in picture..do no.6 and no.11
I have given an attachment

Answer 1

6. if x²-1 is a factor then +- 1 is root of the equation as we know it we put root in the equation it's it's value become 0
putting -1 in eq. a-b+c-d+e=0
a+c+e=b+d
11. (x+y)²=x²+y²+2xy
(12)²= x² +y² +64
x²+y²= 80