A few days ago
i need help factoring 8a³-27…..?
i’ve been working on this one for a long time and just can’t find an answer. if you could tell me step by step how it can be done, that would be great.
Top 2 Answers
A few days ago
Favorite Answer
This is the difference of two cubes which has its own special pattern: a^3 – b^3 = (a-b)(a^2 + ab + b^2)
In this instance, your “a” is (2a) and your “b” is 3. Therefore, it looks like this:
(2a)^3 – (3)^3 = (2a-3)(4a^2 + 6a + 9)
that’s it! 🙂
1
A few days ago
I’ll get you started…Look at each term separately first.
Does 8 have a cube root? What can you cube to get 8? How about 2 * 2 * 2?
a^3 should be obvious
What about 27? What factor can you cube to get 27?
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