Which 2 numbers whose product is 80 gives the sum 20 ?
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Answer:
x+y=20
x=20-y
xy=80
(20-y)y=80
20y -y²=80
y²-20y+80=0
D=20²-4(80)
=400-320
=80
x=-b±√D/2a
= 20 ± 4√5 /2
= 10 ± 2√5
Step-by-step explanation:
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