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xy = 100

x + y = 21 ... so y = 21 - x, and x(21 - x) = 100

x2 -21x + 100 = 0

x =(21+- sq rt(212 - 4*1*100) ) / (2*1)

x = (21 +- sq rt(41) )/2

x = (21 + sq rt(41) )/2 or (21 - sq rt(41) )/2

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12y ago
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Q: What two numbers multiply to 100 and when added equal 21?
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