SOLUTION: {{{(x^2+9)(x^2-2y)}}} By using foil, I got: {{{x^4-2xy^2+9x^2-18y}}} This of course is the wrong answer according to the guide in the back of my textbook. So, I tried a few

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: {{{(x^2+9)(x^2-2y)}}} By using foil, I got: {{{x^4-2xy^2+9x^2-18y}}} This of course is the wrong answer according to the guide in the back of my textbook. So, I tried a few       Log On


   

Question 460452: %28x%5E2%2B9%29%28x%5E2-2y%29
By using foil, I got:
x%5E4-2xy%5E2%2B9x%5E2-18y
This of course is the wrong answer according to the guide in the back of my textbook. So, I tried a few other things and keep getting the wrong answer. The correct answer is as follows:
x%5E4%2B5x%5E2-36
For the life of me, I can't figure out how this could be right. Please help me understand this! Thank you in advance for your help!
Found 2 solutions by edjones, enidcoleslaw:
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Answer: x^4-2x^2y+9x^2-18y
Why doesn't the book's answer have a y someplace in it?
.
Ed

Answer by enidcoleslaw(1) About Me  (Show Source):
You can put this solution on YOUR website!
I've been wondering the same thing, Ed. I really can't wrap my head around this problem. I'm getting most of my other answers correct. And if I do have something wrong, it's usually just a simple mistake that I've overlooked. This really doesn't make sense to me at all. Perhaps it's a printing error. I'll ask my professor in class.