Question

Find the value:- where a+b=8 and. ab=15

Answer 1

(a+b)²=a²+b²+2ab
(8)²=a²+b+2(15)
64-30=a²+b²
34=a²+b²

Answer 2

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

8^2 = a^2 +b^2 +2×15

64 = a^2 +b^2 +30

a^2 +b^2 = 64-30

a^2 +b^2 = 34