1.

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

Answer»

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.



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