Matlab Essentials - Sect 18 - Exponentials and Logarithms

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Math Tutor Series for Matlab Programming.
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how to calculate the logarithm with a base of 20?
Thanks in advance

pufarinu
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how can I solve for 5 unknown using 5 equations, but the equations are nonlinear?

m.a.sherif
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How do you do something like log(30^2/4^2)?
I can get an approximate answer by input n[Log[30^2/4^2]], but how do you get the exact answer, i.e a fraction?

EvanHerlihy
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but older vision cant bring the answer

bernardjustine