Question

if x-y=5 and xy=-6,find the value of x^3 -y^3

Answer 1

hey your ans is here

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given
x-y=5
xy=-6
x3-y3=?
now apply the identity
(x-y)3=x3-y3-3xy(x-y)
(5)3=x3-y3-3×(-6)(5)
125=x3-y3+90
125-90=x3-y3
35=x3-y3
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