SOLUTION: When you expand an equation like, (2x-4y)^3 you get the result of 8x^3- 48x^2y + 96xy^2 - 64y^3 how do you know when to subtract and add while working put the problem? do you go

Question 41218: When you expand an equation like, (2x-4y)^3
you get the result of 8x^3- 48x^2y + 96xy^2 - 64y^3
how do you know when to subtract and add while working put the problem?
do you go -, +, -
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Well all the terms add...the reason that some are positive and some are negative has to do with the expansion...
Did you notice when I did this one, the negative term (-4y) was raised to the first power in the second term and to the third power in the last term...a negative to an odd power stays negative...
Scroll through my solutions today if you did not see it and examine it carefully...
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