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mn = -20
m + n = 8
Hence
m = 8 - n
Substitute
n(8 - n) = -20
8n - n^2 = -20
n^2 - 8n - 20 = 0
It is now in quadratic form .
Factor !!!!!
( n + 2)(n - 10) = 0
n = 2 & n = 10
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