Question

If a - b = 2 , also ab = 15. Then find the value of a^2 +b^2 and a^2 -b^2 ??

Answer 1

a^2+b^2.

=(a-b)^2+2ab.

=(2)^2+(2×15).

=4+30.

=34

a^2-b^2

=(a+b)(a-b)

=34×2

=68