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Let the number be 'm' & 'n'
Hence
mn = 20
m + n = -5
m = -5 -n
Substitute
n(-5-n) = 20
-5n - n^2 = 20
n^2 + 5n + 20 = 0
It is now in quadratic form , so use quadratic eq'n
n = { - 5 +/- sqrt[(5_^2 - 4(1)(20)]} / 2(1)
n = { - 5 +/- sqrt[25 - 80]}/ 2
n = { - 5 +/'- sqrt[-80]} / 2
This is unreseolved because you cannot take the square root of a negative number.
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