I am trying to factor 18r cubed t squared + 12 r squared t squared - 6 r squared t. When I try (3 r squared t + 2t) (6rt -3r), it works out except I get -9r squared t in the middle. Is there any other way to factor this? I'd like an answer as soon as possible. Thank you.

- stapel_eliz
**Posts:**1670**Joined:**Mon Dec 08, 2008 4:22 pm-
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I tried factoring it again and everything checks out except I get -9r cubed t (-9r^3t) in the middle. I want to know how factor the equation so as to get rid of the 9, since it's obviously not in the final answer. Is it (3r^2t +2rt) (6rt -3r) or something else?

- stapel_eliz
**Posts:**1670**Joined:**Mon Dec 08, 2008 4:22 pm-
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Eureka! (I have read that eureka means "I have found it.") I believe I found the factors. Instead of 3 and 6, they are 2 and 9. I surmise that there was a typo in the book and -6rt^2 was meant. If one puts 2 r cubed t squared + 2rt x 9rt -3t,the answer works out. I don't need any more help for this problem.