Question

Find the value of mn if m+n=8 and m-n=2​

Answer 1

m+n=8

m-n=2

adding the equations we get

2m=10

m=5

m+n=8

5+n=8

n=3

mn=5×3=15

Answer 2

m+n=8 - 1

m-n=2 - 2

2m=10

m=5

Putting m=5 in equation 1

5+n=8

n=3

Now mn=5*3=15

Hence answered

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