Someone help please step by step answers, rationalized the denominator of√7/8

I can not figure this stuff out, I need step by step so i can figure this math out, please and thank you
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wotz tu rashunalize????

root(7) is nonrashunal...nuthun yukan du bout that

the bottom=8=2^3, but that dont help

root(7)=2.6457513...
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