Find the coefficient of u^2 in expansion of (2u - 1)^5 using binomial theorem.

Guest Feb 17, 2021

#1**0 **

This website explains it really well --> https://www.mathsisfun.com/algebra/binomial-theorem.html

The exponents for u^{2} is:

(5C3)(2u)^{2}(-1)^{(5 - 2)}

= 10(2u)^{2}(-1)^{3}

= 40u^{2}(-1)

= -40u^{2}, which means -40 is your coefficient and your answer :)

Logarhythm Feb 17, 2021