Question

The coefficient of x in the expansion of (x +3)3 -
(a) 1
(b)
18
(c) 9
(d)
27
Daint Laulas​

Answer 1

Answer :

(d) 27

step by step :

• identity : ( a + b)³ = a³ + b³ + 3ab (a + b)

⇛(x + 3)³ = x³ + 3³ + 3(3)x ( x + 3)

⇛(x + 3)³ = x³ + 9 + 9x(x + 3)

⇛(x + 3)³ = x³ + 9 + 9x² + 27x

Here x is being multiplied by 27

so, coefficient of x is 27.

Answer 2

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