SOLUTION: Factor the polynomial completely. 9+8x-x^2 I've done it, but I know it's not right. Here's what I have: 9+8x+x^2 -x^2-x+9x+9 (-x^2+9)+ (-x+9) -x(x+9)+-1(x+9) (x+9)(-x-

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Factor the polynomial completely. 9+8x-x^2 I've done it, but I know it's not right. Here's what I have: 9+8x+x^2 -x^2-x+9x+9 (-x^2+9)+ (-x+9) -x(x+9)+-1(x+9) (x+9)(-x-      Log On


   

Question 846667: Factor the polynomial completely.
9+8x-x^2
I've done it, but I know it's not right. Here's what I have:
9+8x+x^2
-x^2-x+9x+9
(-x^2+9)+ (-x+9)
-x(x+9)+-1(x+9)
(x+9)(-x-1)
Thank you for your help!
Answer by josh_jordan(263) About Me  (Show Source):
You can put this solution on YOUR website!
The easiest way to factor this is by first rewriting into standard form:

-x^2 + 8x + 9

Next, factor out the negative from the expression, which will make this even easier to factor:

-(x^2 - 8x - 9)

Now, we can easily factor the expression inside the parenthesis:

-(x - 9)(x + 1)