Question

the coefficient of x in the expansion of (x+3)³ is ​

Answer 1

Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

(a+b)³ = a³+b³ + 3ab(a+b)

(x+3)³ = x³ + 27 + 3.x.3(x+3)

          = x³ + 27 + 9x(x+3)

          = x³ + 27 + 9x² + 27x

∴ coefficient of x = 27