Question about Texas Instruments TI-89 Calculator
.0665 2ND 7 (-) .0139 ( X - 48 ) ^ 2 ) , X , 48 , 60 )
The "(-)" is the change-sign key between the decimal point and ENTER.
"X" is the letter X below HOME.
Posted on Feb 07, 2010
I do not think that the TI89 Titanium is bale to perform this calculation in the exact mode or the approximate one. Anyway, the command line appears at the bottom of the screen. It is continued in the second screen.
However if you want the value, here it is.
Posted on Feb 10, 2010
OOPS; the word "bale" should read "able"
Your integral revisited.
When the TI92 (similar to the TI89Titanium as egards the OS) failed to calculate your integral and found a divergent result, I was puzzled and switched to the TI-Nspire CAS. However I was feeling unesase in the back of my mind: Why did the integral diverge?
Then I thought about using the obvious change of variable which would reduce the number of expressions that the calculator has to handle. And that simple change allowed the calculator to find the result.
CHANGE OF VARIABLE
Let X=x-48, then dX=d(x-48)=dx
The lower limit of integration in X becomes 0 and the upper limit of integration becomes 60-48=12.
Now the integral takes the form you see in the screen capture below, and the result is on the right.
When configured to do exact calculations, the calculator failed to find a result (top of screen), but in Auto or Approximate modes, the result was found. Here the FLOAT was set to 12 decimal digits.
Conclusion: Don't just start typing expressions in calculator, but always strive to take advantage of any simplifications before hitting the EXE or = key.
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