How to Use Negative Exponents on a Scientific Calculator

AI Thread Summary
To calculate the present value (PV) using the formula PV = PMT * (1 - (1 + i)^-n) / i, the example provided shows PV = 225 * (1 - (1 + 0.0055)^-42) / 0.005, resulting in PV = 8417.37. Users are seeking guidance on how to input negative exponents on a scientific calculator, specifically the Texas Instruments TI-30x IIS. The discussion highlights the importance of identifying the correct buttons, such as the Change Sign button, which may be labeled as (-). For further assistance, users are encouraged to consult the calculator's manual for detailed instructions. Understanding how to properly use negative exponents is crucial for accurate calculations in financial formulas.
krimsondane
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Homework Statement


PV = PMT *1-(1+i)^-n / i
PV = 225 * 1- (1+.0055)^-42 / .005
PV = 8417.37

How did they get this. how do you use a negative exponent on a scientific calculator.







Homework Equations





The Attempt at a Solution

 
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sorry for not using ? How did they get this? How do you use a negative exponent on a scientific calculator?
 
Does your calculator have a Change Sign button? They are sometimes marked +/-.
 
Mark44 said:
Does your calculator have a Change Sign button? They are sometimes marked +/-.

No it does not I have a texas instruments TI-30x IIS model scientific calculator with 2 lines
 
krimsondane said:

Homework Statement


PV = PMT *1-(1+i)^-n / i
PV = 225 * 1- (1+.0055)^-42 / .005
PV = 8417.37

How did they get this. how do you use a negative exponent on a scientific calculator. I have a calculator, just don't know how to use it correctly.







Homework Equations





The Attempt at a Solution



thx alot
 
I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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