Find the coefficient of x2 in (3x + y)3
Answer & explanation
Correct answer: option 3
(3x + y)3 = 27x3 + y3 + 9xy (3x + y)
= 27x3 + y3 + 27yx2 + 6xy2
⇒ Coefficient of x2 = 27y
Find the coefficient of x2 in (3x + y)3
Correct answer: option 3
(3x + y)3 = 27x3 + y3 + 9xy (3x + y)
= 27x3 + y3 + 27yx2 + 6xy2
⇒ Coefficient of x2 = 27y