The coefficient of y in the expansion of (2y - 5)3 , is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 150.
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Understanding/Application |
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(2y - 5)3 (a - b)3 = a3 - b3 - 3a2b + 3ab2 |
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(2y - 5)3 = (2y)3 - 53 - 3(5)(2y)2 + 3(2y)52 = 8y3 - 125 - 60y2 + 150y Thus, the coefficient of y = 150 |