Best Answer

mn = 80

m -n = -79

Substitute

m - 80/m = -79

m^2 - 80 = -79m

m^2 + 79m = 80 (NB Notice change of signs)

Quadratic Eq'n

m = { - 79 +/- sqrt[)79)^2 - 4(1)(-80)}] / 2(1)

m = { - 79 +/- sqrt[6241 + 320}]/ 2

m = { -79 +/- sqrt[6561]} / 2

m = { - 79 +/- 81}/2

m = -160 / 2 = -80 or

m = 2/2 = 1

Hence n = 1 + 79 = 80

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Q: What 2 number you can mutiply to 80 but subtract to get -79?

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