Finding Roots of Derivatives on Casios

[Matt Agajanian]

Hi all. I put in the expression d/dx(3x^3-10x^2+15) x=x
Next, I opened SOLVE and put in an initial guess. After I press =, I get Syntax Error.

So, I entered the same thing, except I set x=x. Nope. Syntax Error again.

So, I tried writing it as 0=d/dx(3x^3-10x^2+15) and pressed SOLVE. Put in an initial guess. Nope. Syntax error.

If there’s a way to find roots of derivatives on the 991, 115, and ClassWiz models, how do I do that?

Thanks