Retro Review: TIExplorer Plus

12172018, 02:56 AM
Post: #1




Retro Review: TIExplorer Plus
This should have been the modern TI30X (adding the polar/rectangular and D/DMS conversions):
https://edspi31415.blogspot.com/2018/12/...lorer.html 

12172018, 02:26 PM
Post: #2




RE: Retro Review: TIExplorer Plus
What's the maximum number of digits in the denominator that can be displayed? I'm wondering how many digits of the display need that extra segment for the fraction slash.
— Ian Abbott 

12172018, 02:55 PM
Post: #3




RE: Retro Review: TIExplorer Plus  
12172018, 03:11 PM
Post: #4




RE: Retro Review: TIExplorer Plus
(12172018 02:55 PM)Eddie W. Shore Wrote:(12172018 02:26 PM)ijabbott Wrote: What's the maximum number of digits in the denominator that can be displayed? I'm wondering how many digits of the display need that extra segment for the fraction slash. It appears the slash doesn't have to appear before the 4 rightmost digits of the display. The picture of the TI40 Solar (China) on datamath.org shows the calculator showing a mixed fraction with the number starting on the left and the slash somewhere left of the middle. — Ian Abbott 

12182018, 03:54 PM
Post: #5




RE: Retro Review: TIExplorer Plus
(12172018 02:56 AM)Eddie W. Shore Wrote: This should have been the modern TI30X (adding the polar/rectangular and D/DMS conversions): Hi Eddie, nice review. I used to use the OP1 and OP2 features of my TI34 II here when I was teaching the famous quadratic formula to my students. I would ask them to think of two numbers, and give me the sum and product of the numbers. I could then tell them their two numbers by "magic". It turns out that X+Y = n1 and X*Y = n2 easily turns into an equation in the form ax^2 + bx + c, which is easily and quickly solved by the quadratic formula. op1 = (b+sqrt(b^24ac))/(2a) op2 = (bsqrt(b^24ac))/(2a) I would just set variable a=1, b=the sum of the two numbers, and c=the product of the two numbers, press OP1 and OP2 and tell them their original numbers. They thought that was pretty cool, and it made it easier to teach the formula. The calculator you have pictured doesn't seem to have variables, however. 

12242018, 01:02 AM
Post: #6




RE: Retro Review: TIExplorer Plus
(12182018 03:54 PM)Don Shepherd Wrote:(12172018 02:56 AM)Eddie W. Shore Wrote: This should have been the modern TI30X (adding the polar/rectangular and D/DMS conversions): Right, both the TI40 and TIExplorer Plus have only one memory register. Excellent use of OP1 and OP2. 

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