rayaneqds rayaneqds

19-06-2016
Mathematics

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Determine the numerical value of y=(a+1)(b+1), Knowing that ab= -6 and a+b=1

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whiskeyo whiskeyo

19-06-2016

y=(a+1)(b+1)
ab=-6
a+b=1
a=1-b

(1-b)b=-6
-b^2+b+6=0
Δ=25, so b=3 or b=-2

Case 1: b=3, a+b=1, a+3=1, a=-2
y=(-2+1)(3+1)=-4
Case 2: b=-2, a+b=1, a-2=1, a=3
y=(3+1)(-2+1)=-4

So the value of y=(a+1)(b+1)=-4

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