co efficient of y^2 in expansion of expression (y-1)^3
Answers
Answered by
1
-3
as (y-1)^3 = y^3-3y^2+3y+1
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Answered by
1
Answer:
-3
Step-by-step explanation:
(y-1)^3
=y^3-1-3×y^2×1+3×y×1
=y^3-3y^2+3y-1
Therefore,
Coefficient of y^2 is -3
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