Question

1. Find the value of:
(i) a + b when a + b = 9, ab = 20
(ii) p + q* if p- q = 6 and p + q = 14
(iii) mn if m + n = 8 and m - n=2​

Answer 1

1) 9 is given

2) 14 is given

3)m²+n²+2mn=64

m²+n²-2mn=4

m²+n²=34

MN=(64-(m²+n²))/2=15