Grade 9Algebra
If a+b is equals -1,find the value of a cube +b cube+3ab
1 Answer
Vikas TU
Given that a+b = -1 [Cubing on both sides]
(a+b) 3 = (-1)3
a3 + b3 +3ab(a+b) = -1
a3 + b3 +3ab(-1) = -1
a3 + b3 -3ab= -1 [Adding 6ab on both sides]
a3 + b3 +3ab= 6ab – 1
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