Question

A+b=11 and ab=30 find a^2+b^2

Answer 1

Given, a + b = 11 and ab = 30

so, (a + b)^2 = 121

=> a^2 + b^2 + 2ab = 121

so, a^2 + b^2 = 121 - 2(30)

     a^2 + b^2 = 61