Question

if m2+n2=8, mn =4 find m+n​

Answer 1

M x N = 4
2 x 2 = 4
2 + 2 = 4
So m + n = 4

Answer 2

Answer:

m^2+n^2=8

=> (m+n)^2-2mn=8

=> (m+n)^2-2.4=8

=> (m+n)^2=8+8

=> (m+n)^2=16

=> m+n=√16

=m+n=+4 , -4

so m+n=4

m+n= -4