The coefficient of x in the expansion of (x + 3)³ is _____.
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Answered by
2
Answer:
x³ + 27
answer will be x² + 27
Answered by
4
We use the following identity:
【 (x + y)³ = x³ + y³ + 3xy(x + y) 】
⇢(x + 3)³ = x³ + 27 + 3(x)(3)( x + 3)
⇢(x + 3)³ = x³ + 27 + 9x(x + 3)
⇢(x + 3)³ = x³ + 27 + 9x² + 27x
Therefore, the coefficient of x is 27.
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