#binomial_theorem #binomialexpansion #binomialcoeffients #algebra2 #basicalgebra #grade12algebra #aqamaths #edexcelmaths #igcsemaths #alevelmaths #mathspaper1 The coefficient of x^4 was found in the expansion of (a+b)^6 using the binomial theorem. In the binomial expansion of (a+b)^6 the binomial coefficients that contain x^4 must be determined. This maths tutorial on binomial theorem answered questions such as what is the binomial theorem formula, what is binomial expansion, how to find the coefficient of a binomial expansion and how to find the coefficient of x^4 in binomial expansion.