Answers>Maths>IB>Article

Find the constant term in the binomial expansion of (3x + 2/(x^2))^33

Recall that the general term in the binomial expansion of (x+y)^n is (nCr)(x^n-r)(y^r), so by the binomial theorem, the entire expansion is the sum of these terms from r = 0 to n. In this case, n = 33, the first term in the binomial expression is 3x and the second term is 2/(x^2). Substituting these, we obtain the general term for our expansion as (33Cr)(3x)^33-r(2/x^2)^r. We can re-write this as ( x^33-3r)(2^r)(3^33-r)(33Cr) by separating x from its coefficient. Since the question asks for the constant term (i.e. the term independent of x or x^0), we require 33-3r = 0, which is achieved when r = 11. Therefore, we can substitute r = 11 into the expression for the coefficient to obtain the constant term as equal to (33 C 11)(3^22)(2^11).

Answered by Elias G. Maths tutor

4303 Views

See similar Maths IB tutors

Related Maths IB answers

All answers ▸

How do you integrate xln(x) between the limits of 0 and 2?


How do I solve the equation "2cos(x) = sin(2x), for 0 ≤ x ≤ 3π"?


Identify and classify the stationary points of f using the second derivative test, where f is the function given below


Find the intersection point/s of the equations x²+7x-3 and 3x+4


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy