sue101
Simplify the sum.
7/(a+8) + 7/(a^2 - 64)
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ceb105
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Okay so notice that the bottom of the second fraction is infact the "difference of two squares" i.e. (a^2-64)=(x-8)(x+8), then multiply the first fraction by x-8 so that you have equal denominators then you may add them together simply and simplify if nessecary
ajprincess
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What is the lcm of a+8 and a^2-64?
sue101
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64?
lacypennelll
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You play AnimalJam?
ajprincess
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a+8=1*(a+8)
a^2-64=(a+8)(a-8)
lacypennelll
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.-. Thats wha aj stands for
sue101
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aj??
lacypennelll
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^ nvm
sue101
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aj u there?
ajprincess
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yup I am
sue101
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oh ok so that answer i will is C or D
sue101
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??
lacypennelll
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:| Silence
ajprincess
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Lcm of a+8 and a^2-64 is a^2-64
a^2-64=(a-8)(a+8)
So the common denominator is a^2-64
With vat expression do u need to multiply (a+8) to make it a^2-64?
ajprincess
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|dw:1359656931020:dw||dw:1359657016517:dw|
sue101
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I don't have that as a mutilple choice?
ajprincess
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simplify the numerator
Radelp
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so its A?...