Find r(a+8) when r(x)=4/x+7

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Philip P. answered • 05/13/15

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r(x) = 4/(x+7)

The notation r(a+8) means evaluate r(x) when x = a+8:

r(x) = 4/(x+7)

r(a+8) = 7/(a+8+7) = 7/(a+15)

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