Question

2
2
1. Find the value of:
(i) a² + b2 when a + b = 9, ab = 20​

Answer 1

Answer:

(a+b)2 = a2 + b2 + 2ab

putting the value of a+b and ab , we get

(9)2 = a2 + b2 + 2x 20

36= a2 +b2 + 20

therefore a2+b2 = -4