Question

please give me answer it's urgent

Answer 1

Heya dear !!!



(18) The Coefficient of X in the expansion of (X+3)² is



Solution :- ( X+3)³



Here,

A = X and B = 3


We know that,


( A + B)³ = (A)³ + (B)³ + 3×A × B ( A + B)



( X)³ + (3)³ + 3 × X × 3 ( X + 3)



X³ + 27 + 9X(X+3)



X³ + 27 + 9X² + 27X



X³ + 9X² + 27X + 27



Here,


Coefficient of X is 27.




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