CODEWITHSUNDEEP
javascriptmathalgebrapolynomial-math
Prem
Prem

Reputation: 16239

What's the opposite of JavaScript's Math.pow?

I'm having a mental block here, and algebra not really being my thing, can you tell me how to re-write the JavaScript code below to derive the variable, c, in terms of a and b?:

a = Math.pow(b, c);
c = ?

Thanks!

Upvotes: 38

Views: 24760

Answers (2)

dusan
dusan

Reputation: 9273

c = Math.log(a)/Math.log(b)

Upvotes: 81

Charlie Martin
Charlie Martin

Reputation: 112404

Logarithms. You want the logarithm of a. B is the base, c is the exponent, so

logb a = c

Upvotes: 9

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