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Best Answer
Let the number be 'm' & 'n'
Hence mn = 88
m + n = 18
m = 18 - n
Substitute
(18 - n)n = 88
18n - n^2 = 88
n^2 - 18n + 88 = 0
This does not readily factor so apply the Quadratic Eq'n.
n = { --18 +/-sqrt[(-18)^2- 4(1)(88)]} 2(1)
n = { 18 +/- sqrt[324 -352]} / 2
n = { 18 +/-sqrt[-28]} / 2
This is unresolved as you cannot take the 'square root; of a negative number.
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