Solving with multiple unknown variables & more

[Han]

(03-25-2015 01:58 PM)Ollie Wrote:  Hey, I just recently got the HP Prime calculator and I have a few issues.
I want to solve, or "rearrange" an equation with multiple unknown variables.
Let's say I have an equation "x-a = 500" and solve for x I would get "x = 500+a".
Is there a way to do this on HP Prime or any symbolic calculator?

As Bill_G suggested, you can use the solve command (in CAS view). If you simply type solve on the command line and hit the [Help] key, you will see some information and examples of how to use this command.

Quote:Another issue I'm having is how does one create custom functions and calculate their values at specific points.
Eg. I want to create a function f(x) = x^2+50, the get the derivative f'(x) and calculate f'(5).
I know you can do this with diff(x^2+50) but after that I'd have to copy the result into the where-block so I can get 2x | x=2 => 4.
There must be a simpler way to do this, right?

You can create functions by defining them in the following manner:

f(x):=x^2+50; // on the right side of the screen you will see how functions are represented internally
f(1); // this gives 51 as the result
diff(f(x),x); // this produces 2*x as the result
g(x):=<copy and paste result above using the touchscreen>
g(2); // this gives 4 as the result

In creating g(x), you could simply type:

g(x):=

and then tap the screen where the 2*x is (twice) to copy.