gwendolyn555 gwendolyn555

13-10-2014
Mathematics

contestada

If 21^(2x)=9 then what is the value of 21^(-x)? Answer and solution please ;)

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konrad509 konrad509

13-10-2014

[tex]21^{2x}=9\\ (21^x)^2=9\\ 21^x=3\\ (21^x)^{-1}=3^{-1}\\ 21^{-x}=\frac{1}{3} [/tex]

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