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OpenStudy (anonymous):
Mulitply and Simplify ( 9 + 2v3 ) ( 9 - 2v3 ) v stands for sqrt A.69 - 4v3 B. 81 - 4v3 C. 69
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OpenStudy (anonymous):
I think its B.
OpenStudy (anonymous):
did you actually foil or just guess?
OpenStudy (anonymous):
i distributed
OpenStudy (anonymous):
it is similar to (a+b)(a-b)=a^2 -b^2 ( 9 + 2v3 ) ( 9 - 2v3 ) = 9^2 - (2v3)^2 = 81 - 12=69
OpenStudy (anonymous):
show how you distributed for your next question so your work can be checked
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