Step 1. The coefficient of x^2 in the expansion of (1+x/5)^n is 3/5, (i) Find the value of n. sounds like we want to use pascal's triangle and keep track of the x^2 term. When the exponent is 1, we get the original value, unchanged: An exponent of 2 means to multiply by itself (see how to multiply polynomials): For an exponent of 3 just multiply again: (a+b)3 = (a2 + 2ab + b2)(a+b) = a3 + 3a2b + 3ab2 + b3. this is going to be equal to. C.C. Description. If we use combinatorics we know that the coefficient over here, This is the tricky variable to figure out. The binomial expansion calculator is used to solve mathematical problems such as expansion, series, series extension, and so on. From there a 's exponent goes down 1, until the last term, where it is being raised to the 0 power; which is why you don't see it written. Edwards is an educator who has presented numerous workshops on using TI calculators.
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