Topic 8 0.0 / 5 ? MathematicsBinomial expansionASEdexcel Created by: Jemma1494Created on: 04-06-21 14:38 Pascal’s triangle Used to quickly expand expressions such as (x+2y)^7 1 of 5 How to write Pascal’s triangle Each line of the triangle is the sum of the two products above 2 of 5 ! Factorial notation ! Symbol used to show multiplications e.g. 4! = 4x3x2x1 3 of 5 Choosing parts of Pascal’s triangle with factorial notation nCr = n!/r!(n-r)! n = row of triangle r = entry in row 4 of 5 Binomial expansion (a + b)^n = a^n+ (nC1)a^n-1b + (nC2)a^n-2b^2 + … 5 of 5
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