Question

if. a+b =-1 then the value of a³+b³-3 ab is
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Answer 1

Answer:

As, [a³+b³+3ab(a+b)=(a+b)³]

Given: (a+b)=–1

» a³+b³+3ab(–1)=(–1)³

» a³+b³–3ab = –1