Question

if m+n=5 and mn=12 then what is the value of m² + n²
a) 2
b)6
c) 1
d) 3
e) none​

Answer 1

m+n=5

(m+n)^2=25

m^2+n^2+2mn=25

m^2+n^2+24=25

therefore

m^2+n^2=1

Ans=1