Apparently.... (x+c-1)^3 - (x-1)^3 = 3c(x-1)^2 - 3(x-1)c^2 + c^3
Someone please explain why or what rule this is, Will be much appreciated
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Originally Posted by Snaggle Apparently.... (x+c-1)^3 - (x-1)^3 = 3c(x-1)^2 - 3(x-1)c^2 + c^3
Subtract and factor.
You may also use the difference of two cubes but Plato's method is better because of the factors involved when doing the difference of two cubes
A slight variation- if we let a= x- 1 then this is . Now replace a by x- 1 again to get
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