What am I doing wrong?

Problem: -mn-mr=s, solve for m

My input: solve(-mn-mr=s, m)

Output on calculator: 1=-s/mn+mr

Real answer: m=-s/n+r

Why isn't it displaying it the way I want it to?

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- Feb 19th 2008, 04:47 PMrikerMultiple Variable Equation, T-89 Titanium
What am I doing wrong?

Problem: -mn-mr=s, solve for m

My input: solve(-mn-mr=s, m)

Output on calculator: 1=-s/mn+mr

Real answer: m=-s/n+r

Why isn't it displaying it the way I want it to? - Feb 19th 2008, 04:54 PMgalactus
For goodness sake, you have to multiply the variables, otherwise, the calculator thinks it's one variable.

Enter -m*n-m*r=s

You can't just enter -mn. It has to be multiplied. The calculator is a dumb tool. It doesn't know that. - Feb 19th 2008, 08:33 PMriker
Thanks so much. There's another problem I ran into.

Problem: p=4rt-3rs, solve for r

My input: solve(p=4*r*t-3*r*s,r)

Output on calculator: r= -p/3s-4t

Real answer: r= p/4t-3s

I should be set for awhile after I'm helped with this one. - Feb 19th 2008, 10:09 PMearboth