Question

if x=1+a+a^2+a^3+...,|a|<1 and y=1+b+b^2+b^3+...,|b|<1,then find 1+ab+a^2b^2

Answer 1

Answer:

If `a-b=4` and `a+b=6` then find `a^2+b^2`

You will find your answer in this link

follow pls