Wrong answer when evaluating log(10^12)  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Wrong answer when evaluating log(10^12) (/thread210123.html) 
Wrong answer when evaluating log(10^12)  Daniel Greenidge  01262012 Hello everyone, I know from the power property that log(10^12) should be 12. WolframAlpha corroborates this. However, when I evaluate this on both my HP 15C and 50g, the answer turns out to be 11. Here are the exact keystrokes I am using for my 15C:
10 Any ideas why this might be?
Thank you, Re: Wrong answer when evaluating log(10^12)  Bart (UK)  01262012 Hint:
Edited: 26 Jan 2012, 11:26 a.m.
Re: Wrong answer when evaluating log(10^12)  Gerson W. Barbosa  01262012 Quote: The answer is right. The input is wrong. You're actually entering 10*10 ^{12}, that is, 10^{1} * 10 ^{12} = 10^{112} = 10^{11} Enter the mantissa first, then press EEX and enter the exponent:
1 When the mantissa is 1, it can be omitted.
Gerson.
Re: Wrong answer when evaluating log(10^12)  Daniel Greenidge  01262012 Thank you for your help! I feel a bit imbecilic right now but I certainly shall not repeat my mistake.
Regards, Re: Wrong answer when evaluating log(10^12)  Gerson W. Barbosa  01262012 Quote: Bart, I hadn't read your post yet when I said the answer of the calculator was right. "Expected answer" appears to be a more didactic expression, I should have used it myself. By the way, my HP15C gave a lot of "wrong answers" to me, especially in the beginning, when it was just replacing a TI59. Oh, and more recently, just some threads below my HP42S was refusing to give me the answers I expected :) Regards,
Gerson. Edited: 26 Jan 2012, 6:53 p.m.
