How can i get a negative number with my texas instrument TI 83 plus in the Finance application (for present value number)?

Press the APPS key, select the Finance app, and then TVM_Solver.

For N, enter 5 * 1 2 for 5 monthly payments.
For I%, enter 1 . 9 / 1 2 for the monthly interest rate.
For PV, enter 1 8 0 0 0 for the present value of the loan.
Make sure "END" is highlighted on the bottom line.
Move the cursor to the "PMT" line and press ALPHA ENTER to compute the monthly payment. You'll get a negative number since this represents something you pay out.

What are the options you are referring to? On a TI8xPlus family of calculators, the option [1:finance] is part of the OS. It cannot be erased nor deleted. Any other application you transfer on the calculator will be listed after the [1:Finance]. What I suspect is that you or someone else erased the other applications. Just go to the education.ti.com and download what you need.

You can download TI apps from
http://education.ti.com/educationportal/sites/US/productDetail/us_ti83p.html?bid=7

Another source for programs and apps is
http://www.ticalc.org

Press the APPS key to bring up the Applications menu. Press 1 to select "Finance..." Press 1 to select "TVM Solver..."

You're both right, in a way. (-64)^3 is -262144. The square root of that is +/- 512i. Take your choice as to the sign.

For what it's worth, the TI-84, TI-86, TI-89, and the HP 50g all go with the negative value.

Try [2nd], [MODE] or [2nd] [ON] or [CLEAR] or take out a battery, this won't erase anything whatsoever as long as you have the factory back up battery in it, which unless you took it out, don't worry, you have it

Use the (-) key next to the decimal point to enter the negative value, not the - key.

I reccently had the same problem, but I have a Ti-84 Plus,and I am disgusted by how poorly this matter is covered by Texas Intruments. Esp. since the solution is rather simple.

The antilog key is [2nd] [log] or the 10^x. On your screen it should apear as 10^( and then you just input the value that you want to find the antilog of.

When used to solve pH problems remember to input the pH value as a negative number, since pH= -log[H+] then [H+]= antilog(-pH).

Hope that helped))))) ^^

The example found on Texas Instruments Knowledge Base will demonstrate how to calculate future value on a TI-83 Plus.

The Knowledge Base can be accessed by clicking on the URL below:

http://epsstore.ti.com/OA_HTML/csksxvm.jsp?nSetId=68565&nUsePub=NO&jttst0=6_23871,23871,-1,0,&jtfm0=&etfm1=&jfn=ZG9FB38B4A2AA5FD2B95856A86C456B04891A1DF1818254BD8745136644414BBD77A84F7D2D719EC988ABF354C41ACA7922D

The examples listed on Texas Instruments Knowledge Base will demonstrate how to compute the NPV on your TI-83 Plus.

The Knolwedge Base can be accessed by clicking on the URL below:

http://epsstore.ti.com/OA_HTML/csksxvm.jsp?nSetId=71547&nUsePub=NO&jttst0=6_23871,23871,-1,0,&jtfm0=&etfm1=&jfn=ZG06CD0B03AAAF941AFC19C76DA52265118B53A25EFCD6CCEA4B0892BBD7051726DCA9C647310C32EA7E6FB7570A304971B4