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calculate (2x-1)^5

( 2x - 3y )4
= (2x)4 + 4(2x)3(-3y) + 6(2x)2(-3y)2 + 4(2x)(-3y)3 + (-3y)4

32x^5 - 80x^4 + 80x^3 - 40x^2 +10x - 1

binomial theory, or binomial expansion i forget what it is called.

Pascal's triangle? yes, I know it

so I have to apply th formule of the development of i don't know do you say power
(a^n)?

http://www.mathsisfun.com/algebra/binomial-theorem.html
it's the binomial theorem.

link explains it very well.

I think today I won't do my math's homeworks.

you're skipping a day of math homework? it will only be harder tomorrow...

@giulsvalentini I will help...