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 tried to combine those 2 formulas but it didn't work. I tried using another case where there are 2 red balls and 2 blue balls only so when combining the formula I got ##\frac{(4-1)!}{2!2!}=\frac{3}{2}## which does not make sense. Is there any formula to calculate cyclic permutation of identical objects or I have to do it by listing all the possibilities? Thanks
Since ##px^9+q## is the factor, then ##x^9=\frac{-q}{p}## will be one of the roots. Let ##f(x)=27x^{18}+bx^9+70##, then: $$27\left(\frac{-q}{p}\right)^2+b\left(\frac{-q}{p}\right)+70=0$$ $$b=27 \frac{q}{p}+70 \frac{p}{q}$$ $$b=\frac{27q^2+70p^2}{pq}$$ From this expression, it looks like there is no greatest value of ##b## because increasing the value of ##p## and ##q## will also increase the value of ##b##. How to find the greatest value of ##b##? Thanks
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