Lorraine1954 Lorraine1954

27-01-2018
Mathematics

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Find the possible value or values of r in the quadratic equation r2 -7r-8=0

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dannielle dannielle

27-01-2018

r^2+r-8r-8=0
r(r+1)-8(r+1)=0
(r+1)(r-8)=0
r+1=0, r=-1
r-8=0 , r=8

answer: r=-1 or r=8

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