I understand the numerical ones, but am having trouble with the variable ones...

It works in theory, and I can see how it would work, but when I substitute numbers for the variables, it doesn't work:

x = 2, y = 3

This was the expression: x^{2}y^{3}+xy

4*27+6 = **114**

This was the answer: xy(xy^{2} + 1)

6(2*9) = 12*54 = **648**

or...

6(18) = **108**

Did I evaluate the equations wrong? I can't seem to get the same answer for them both...

Let's look at

Are you sure that you plugged everything in, correctly? We know that

is correct.

Do you think that

is the correct evaluation of

?

Also, what is the next multiple of 6 after 108?

Assuming that the answer to the first question is "yes", the answer to the second question should tell you that the value of the second factor

should be

.

Now, go back and re-evaluate

.

If you're still stuck, please reply and show your all the steps you attempted to correct your work.