If your calculator "breaks" and refuses to display answers in terms of x (showing you only numbers instead), you probably stored a number in x and forgot to delete the variable.If you then erase the variable (Menu > Actions > Clear a-z), your calculator will think of x as a letter again.Your calculator will think of x as "7" instead of thinking about it as a letter. For example, 7→x (7, ctrl, var, x) stores the value 7 into the variable x.This can be a curse rather than a blessing if you actually wanted the value in terms of x. If you store a value into x and then take a derivative with respect to x, your calculator will display the answer as a number instead of as an expression in terms of x.Storing a value into a variable and then typing (or pasting in) an expression is a very fast way to solve problems.Check out my calculator review page for more information. If you're not planning to take AP Calculus, I suggest getting a different calculator.Open the file and hit control-F on your computer keyboard to search. Texas Instruments publishes an Nspire reference guide that you can download and print out. For example, nSolve(x 2=81,x) gives you 9 instead of.
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