Question about Texas Instruments TI-85 Calculator

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If it does not have it, use the equivalent formals

Log_base b(a)= ln(a)/ln(b) or log_10(a)/Log_10(b).

Posted on Jan 30, 2016

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Posted on Jan 02, 2017

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SOURCE: how to enter a different log base (other than base

You cannot. You must use the formula

log in base b of a =log(a)/log(b) or

log_b(a)=ln(a)/ln(b)

where log(a) is common logarithm of a and ln(a)= natural logarithm of a

If you had the TI84PLUS or TI84PLUS SE, you could have installed the newest OS upgrade and that upgrade uses math print which allows the user to calculate logarithms in any base directly.

Posted on Mar 22, 2010

The TI-30XA calculates logarithms to base e and base 10. You can calculate the log of x to any base b by calculating the logarithm of x and dividing it by the logarithm of b: log(x)/log(b) or ln(x)/ln(b).

Nov 29, 2013 | Texas Instruments TI-30XA Calculator

The TI 86 has two logarithmic functions: natural logarithm **(ln) **and common (decimal) logarithms **(log)**. If you need the logarithm in any other base than e or 10 you need to use one of the two equivalent expressions

**log_b(x) =ln(x)/ln(b) =log(x)/log(b)**

Here b is the value of the base of the logarithm and x is the argument (the value whose logarithm you are seeking). Of course the argument x must be a positive number.

**Note:** On the TI 86 the log function can calculate the logarithm of a complex number, according to the manual.

Here b is the value of the base of the logarithm and x is the argument (the value whose logarithm you are seeking). Of course the argument x must be a positive number.

Sep 22, 2013 | Texas Instruments TI-86 Calculator

You can calculate the log to any base by using the relationship logb(x) = log(x)/log(b) = ln(x)/ln(b). In words, the base-b logarithm of x is the logarithm of x divided by the logarithm of b.

So, to calculate the log base 3 of 18, press

1 8 LOG / 3 LOG =

or

1 8 LN / 3 LN =

So, to calculate the log base 3 of 18, press

1 8 LOG / 3 LOG =

or

1 8 LN / 3 LN =

Mar 06, 2011 | Texas Instruments TI-30XA Calculator

You press [alpha] then [f3] to open the func menu. Use the arrow keys to highlight logbase( and press enter.

then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)

[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)

[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

Mar 04, 2011 | Texas Instruments TI-85 Calculator

To compute a log to any base, enter it as log(x, base). You can either select log from the catalog or simply type it in.

Nov 15, 2010 | Texas Instruments TI-83 Plus Calculator

The TI-83 doesn't have such a function built-in. Use the relationship logb(x) = log(x)/log(b) = ln(x)/ln(b).

May 13, 2010 | Texas Instruments TI-83 Plus Calculator

The TI-83+ has keys for natural and common logarithms (base e and 10, LN and LOG, respectively). If you want to calculate the logarithm to another base, you have to use the relationship

LOGb(x) = LOG(x)/LOG(b) = LN(x)/LN(b)

LOGb(x) = LOG(x)/LOG(b) = LN(x)/LN(b)

Apr 10, 2010 | Texas Instruments TI-83 Plus Calculator

You can calculate the logarithm to any base by using the relationship

logb(x) = log(x) / log(b) = ln(x) / ln(b)

Thus, if you calculate log(64) / log(2), you will get 6, and the same with the natural logarithm.

logb(x) = log(x) / log(b) = ln(x) / ln(b)

Thus, if you calculate log(64) / log(2), you will get 6, and the same with the natural logarithm.

Mar 12, 2010 | Texas Instruments TI-85 Calculator

Basically you first have to put your answer into scientific notation by pressing the 3rd key then the 6 key. The screen display should change to one big zero and two small zeros.

I was workinggon the same problem with a -log of a chemistry problem to get pH and I knew the answer because I calculated it on it TI-85, but we are not allowed to use graphing calulators on the exam (:-((() so I had to figure out how to do it on this one!

For example, I had pH =-log(2.828947x10^4)

On the TI-36X you change to scientific notation using the instructions above. Once the three zeros enter on the screen:

[4]

[-]

[2nd]

[10^x]

1^-04 should appear on screen, then you multiply by 2.828947

[x]

[2][.][828947]

then your screen will show the answer in scientific notation.

2.828947 in big numbers and in small numbers -04

From there you simply press:

[log]

and your answer will show up as a negative number. Just take the absolute value of that and you have your answer. Took me like 30 minutes the night before a huge chemistry exam to figure that out! Hope it helps someone!

I was workinggon the same problem with a -log of a chemistry problem to get pH and I knew the answer because I calculated it on it TI-85, but we are not allowed to use graphing calulators on the exam (:-((() so I had to figure out how to do it on this one!

For example, I had pH =-log(2.828947x10^4)

On the TI-36X you change to scientific notation using the instructions above. Once the three zeros enter on the screen:

[4]

[-]

[2nd]

[10^x]

1^-04 should appear on screen, then you multiply by 2.828947

[x]

[2][.][828947]

then your screen will show the answer in scientific notation.

2.828947 in big numbers and in small numbers -04

From there you simply press:

[log]

and your answer will show up as a negative number. Just take the absolute value of that and you have your answer. Took me like 30 minutes the night before a huge chemistry exam to figure that out! Hope it helps someone!

May 09, 2009 | Texas Instruments TI-36 X Solar Calculator

"♦" "7" will give you log base 10 for the texas instuments TI-89 Titanium

Feb 20, 2009 | Texas Instruments TI-89 Calculator

Apr 03, 2014 | Texas Instruments TI-85 Calculator

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