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(A)    1/8
(B) ...
(C) ...
(D) ...
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*This question is included in Nova Math - Problem Set T: Factoring

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Posted: 09/26/2013 12:04
I don't get why 7^8+7+7^8= 7^8(7+1)
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Posted: 09/26/2013 12:25
Jennifer, the explanation did not say 7^8+7+7^8= 7^8(7+1) as you wrote, instead 7^8*7+7^8= 7^8(7+1). It is just distributive property, by factoring out 7^8, we get (7+1) in the parentheses, hence we can cancel the denominator.
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