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Algebra homework help? (2a-b)^3?
Can you show the steps on how to do this? online it said it was 8a^3 - 12a^2b + 6ab^2 - b^3.
However i got 8a^3 - 10a^2b - 6ab^2 - b^3....
HELP!!! just easy simplifying... I'm in 9th grade
ok thankssss
1 Answer
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- MercyLv 77 years ago
(2a-b)(2a-b) = 4a^2 +b^2 -4ab
(2a-b)( 4a^2 +b^2 -4ab)
= 8a^3 +2ab^2 -8a^2b -4a^2b-b^3+ 4ab^2
= 8a^3 +6ab^2 -12a^2b -b^3
)
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