Ti-89 Approx v. Exact Answers
Is there a way on an 89 to enter an approximate value without doing any operations and get an exact answer?
Ex. Enter in 1.73205(approx) and get out sqrt(3)?
Or is there a way to find a zero of an equation and or graph and get out an exact answer as opposed to an approximation?
Ex. Enter in 1.73205(approx) and get out sqrt(3)?
Or is there a way to find a zero of an equation and or graph and get out an exact answer as opposed to an approximation?
posted by Carrie Desmond at 7:32 PM
1 Comments:
Turning aprox's into exact doesn't make sence mathematically so no, thats not possible. Your best chance would be to just try random fractions or radicals that seem like they'd be close to the number you want. About finding zeros, something i used to like doing was to graph y=0, then find the intersection of the 2 graphs, on the other hand, You could just use the solve key to find zeros. Also, if you want a more precise approximation, go to MODE, scroll to "Display Digits" and turn it to Float 12. This will give you 12 units instead of 6 (im guessing yours is 6 as you wrote 1.73205). Also, if you want a fraction instead of a decimal, go to Mode, then go to Exact/Approx and turn it to Exact. This will turn say an answer that would normally be .8 into 4/5.
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