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OpenStudy (anonymous):
I know this is easy, but I forgot. :P If b^2 + d^2 = 21 and (b+d)^2 = 25, then what is bd?
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jimthompson5910 (jim_thompson5910):
(b+d)^2 = 25 b^2 + 2bd + d^2 = 25 2bd + (b^2 + d^2) = 25 2bd = 25 - (b^2 + d^2) 2bd = 25 - (21) I'm sure you see what to do from here
OpenStudy (anonymous):
Yeah I do, thanks!
jimthompson5910 (jim_thompson5910):
you're welcome
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