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July 7th, 2015, 03:52 PM   #1
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How to perform log base 4 in win scientific calculator?

I solved this exercise: $\log_4 (x^2 +15)=3$, where $x=\pm7$.
Then I wanted to check if both numbers were solution, with the help of windows scientific calculator, but till now I don't know how.

Could you show me? Thank you.

Last edited by skipjack; July 7th, 2015 at 06:14 PM.
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July 7th, 2015, 04:02 PM   #2
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Use the fact that $\log_b a ={ \log_c a \over \log_c b}$
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July 7th, 2015, 04:09 PM   #3
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Quote:
Originally Posted by v8archie View Post
Use the fact that $\log_b a ={ \log_c a \over \log_c b}$
Wow, it works! Thanks.

Last edited by Mohajir; July 7th, 2015 at 04:20 PM.
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