Question

Find a^2+b^2 by using (a-b)^2 if a=-5 b=-2.
(Hint: a^2+b^2 = (a-b)^2-2ab)​

Answer 1

Answer:

a²+b²=(a-b)²+2ab

={-5-(-2)}²+2(-5)(-2)

=(-5+2)²+20

=(-3)²+20

=9+20=29