Find the coefficient of u^2 in expansion of (2u - 1)^5 using binomial theorem.
+592 This website explains it really well --> https://www.mathsisfun.com/algebra/binomial-theorem.html
The exponents for u2 is:
(5C3)(2u)2(-1)(5 - 2)
= 10(2u)2(-1)3
= 40u2(-1)
= -40u2, which means -40 is your coefficient and your answer :)
