05-09-2018
Mathematics

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Given that 2^x=7 then what is 4^x-1

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nhatminh082004pc2e48 nhatminh082004pc2e48

05-09-2018

4^x=2×2^x=2×7=14
4^x-1=14-1=13

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grujan50 grujan50

05-09-2018

It depend what you mean

First 4∧x -1 = (2∧2)∧x -1 = (2∧x)∧2 -1 = 7∧2 -1 = 49-1 = 48

Second 4∧(x-1)= (2∧2)∧(x-1)=2∧(2x-2)=(2∧x)∧2/4=7∧2/4=49/4

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