Question
What is the coefficient of z in (z−5)3?
Answer: Option D
:
D
(z−5)3=z3−53−3×z2×5+3×z×52
[Using(a−b)3=a3−b3−3a2b+3ab2]
⇒(z−5)3 = z3−125−15z2+75z
Hence, the coefficient of z is 75.
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:
D
(z−5)3=z3−53−3×z2×5+3×z×52
[Using(a−b)3=a3−b3−3a2b+3ab2]
⇒(z−5)3 = z3−125−15z2+75z
Hence, the coefficient of z is 75.
Was this answer helpful ?
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