Hello all,

I've received so much help in this forum and really appreciate that you guys are able to figure out what I'm really asking despite my typos.

Anyway, here's another one from *Beginning Algebra (sixth ed.); Chapter 5, Section 5.2 Adding and Subtracting Polynomials.*

**85. **(11*r*^{2}s + 16*rs *- 3 - 2*r*^{2}s^{2}) - (3*sr*^{2} + 5 - 9*r*^{2}s^{2})

The answer is: 8*r*^{2}s + 16*rs - *8* + *7*r*^{2}s^{2 }

I got the same answer except for 8*r*^{2}s. I don't understand how 8*r*^{2}s is a solution because *r*^{2}s is not in the subtrahend. My understanding of operations on Polynomials is that the variables and exponents should be in the same order. But in this case, are *r*^{2}s and *sr*^{2} the same?

Also, where can I find more information on the order that the result should be simplified to?

Thank you.