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Mathematics 13 Online
OpenStudy (anonymous):

Factor 72a^2+5a-25. I get 9a(8a+5)-5(8a-5), the book gets (9a+4)(8a-3). When i multiply that back out I do not get the original eq. What's up? Is the book wrong?

hero (hero):

72a^2+45a - 40a -25 9a(8a+5)-5(8a+5) (8a+5)(9a-5)

hero (hero):

Book's wrong

OpenStudy (anonymous):

dastardly book! and here i was trying to do it over and over again...thanks for clearing it up for me (and my sign error!)

hero (hero):

lol

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