integral in solve
04-23-2015, 07:32 PM
Post: #1
 lrdheat Senior Member Posts: 828 Joined: Feb 2014
integral in solve
I need a refresher for this solve question on Prime (asked in not quite HP for this problem on my WP 34S). I want to solve (integral x^2 from 0 to x)=10.

My CASIO 9860gii solve app is straight forward and quickly comes up with ~3.107.

I know that this problem is easily accomplished on the Prime, but I can't remember how.
04-23-2015, 08:09 PM
Post: #2
 DrD Senior Member Posts: 1,133 Joined: Feb 2014
RE: integral in solve
Something like:

solve((int(x^2,x,0,x)) = 10,x); // Exact checked in CAS settings
-or-
solve((∫(x^2,x,0,x)) = 10,x);

Seems to work ok.
04-23-2015, 08:33 PM
Post: #3
 lrdheat Senior Member Posts: 828 Joined: Feb 2014
RE: integral in solve
It does work, and is easy!

How can I do this on the solve app?
04-26-2015, 08:43 PM
Post: #4
 lrdheat Senior Member Posts: 828 Joined: Feb 2014
RE: integral in solve
DrD...your example worked for the problem above, but doesn't work for solving (integral x^3-2*x^2+sqrt(13*x)dx from 0 to x)=10 (answer is ~2.61)

How do I do this in CAS, and are things different in home?
04-27-2015, 01:11 PM
Post: #5
 parisse Senior Member Posts: 1,301 Joined: Dec 2013
RE: integral in solve
solve(int(x^3-2*x^2+sqrt(13*x),x,0,t)=10,t)
Perhaps you had a problem because you are using the same x for two different meanings.
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