How TI-89 Calculator Rearranged Exponent Confusion - Ben

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SUMMARY

The TI-89 calculator successfully rearranged the expression $$ 2^{2m+1}-1$$ to $$ 2\times 4^m - 1 $$ using two fundamental exponent rules: \((a^b)^c = a^{bc}\) and \(a^{b+c} = a^b a^c\). The second rule was applied to simplify the exponent by separating \(2m+1\) into \(2m\) and \(1\), allowing for the transformation into a more manageable form. This demonstrates the calculator's capability to handle complex algebraic manipulations efficiently.

PREREQUISITES
  • Understanding of exponent rules, specifically \((a^b)^c = a^{bc}\) and \(a^{b+c} = a^b a^c\)
  • Familiarity with algebraic expressions and simplification techniques
  • Basic knowledge of calculator functionalities, particularly the TI-89
  • Experience with manipulating variables in mathematical expressions
NEXT STEPS
  • Study the application of exponent rules in algebraic simplifications
  • Explore advanced features of the TI-89 calculator for algebraic manipulation
  • Learn about polynomial identities and their applications in problem-solving
  • Investigate common pitfalls in exponent manipulation to avoid mistakes
USEFUL FOR

Students, educators, and anyone interested in mastering algebraic expressions and utilizing the TI-89 calculator for complex mathematical calculations.

Benthal
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My TI-89 calculator rearranged $$ 2^{2m+1}-1$$ to $$ 2\times 4^m - 1 $$
I can't for life of me work out how it did it. Is anybody able to put me out of my misery?

Thank you in advance!

Ben
 
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It used two exponent rules:

\left(a^b\right)^c=a^{bc}

a^{b+c}=a^ba^c

So start by using the second to get rid of that pesky +1 in 2^{2m+1}
 
Oh god! Of course. I must not be feeling well.

Thanks.
 

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