plz solve

Asked by  | 11th May, 2008, 09:13: AM

Expert Answer:

x²-4x-5=0

x²-5x+x-5=0

x(x-5)+1(x-5)=0

(x-5)(x+1)=0

x = 5,-1 therefore α = 5 and β = -1

and α3 = 53 and β3 = (-1)3

α3 = 25 and β3 = -1

α³ + β³ = 25-1 = 24

Answered by  | 13th May, 2008, 01:09: AM

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