Question

if a - b = 0.9 and ab = 0.36 find
a² - b²​

Answer 1

(a+b)²

=(a-b)²+4ab

=0.9²+4×0.36

=9/4

=2.25

now,a²-b²

=(a-b)(a+b)

=0.9×2.25

=2.025