Question

The coefficient of x² in the expansion of (x + 1)³ is

Answer 1

Answer:

3

Step-by-step explanation:

given,

(x+1)^3 coefficient of x^2 is,

(x+1)^3=x^3+1+3x^2.1+3x1^2

coefficient is 3

Answer 2

Answer:

      ( x + 1 )³

sol: x³ + 1 + 3x( x + 1 )

      x³ + 1 + 3x² + 3x

  ⇒ x³ + 1 + 3x² + 3x

∴ The coefficient of x² in the expression ( x + 1 )³ is '3'