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ab=105
a+b=20
(20-b)b=105
-b^2 +20b -105=0
x^2 -20x +105=0
using the quadratic formula we get:
(-b +-sqrt(b^2-4ac))/2a
(20 +-sqrt(20^2-4*105))/2
10+-sqrt(-20)/2
the answers are:
10+sqrt(-5) and 10-sqrt(-5)
10+sqrt(5)i and 10-sqrt(5)i
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