![]() ![]() Use the Catalog key (located above the multiplication key), choose d/dx, and type your equation in. Note: You can also do implicit differentiate without using the impDif function.Remember to erase the variable (Menu > Actions > Clear a-z) when you're finished! If you forget, your calculator will assume that x=2 for all future calculations, not necessarily an assumption you want to make.Notice that your calculator will spit out an actual number this time instead of an answer in terms of x you can compare that number to what you'd get by plugging 2 into the answer you derived by hand. You can do this by storing 2→x (2, ctrl, var, x), then scrolling to highlight the answer your calculator gave you, then hitting Enter twice to evaluate that expression with the assumption "x=2".If that happens, plug in 2 for x for both the calculator's answer and your own answer and make sure that the results match. Sometimes it's hard to tell whether the answer your calculator spits out is the same as what you got solving by hand."If you plan to do symbolic computations using undefined variables, avoid storing anything into commonly used, one-letter variables such as a, b, c, x, y, z, and so on." ( Nspire reference guide, page 234 / PDF page 238).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. ![]()
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