anonymous
  • anonymous
If (a, -20) is a point on the graph of y=x^2-9x, what is a?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
nincompoop
  • nincompoop
solve for x
anonymous
  • anonymous
@nincompoop Yes the first thing you need to do is solve for x
nincompoop
  • nincompoop
are you just looking for an answer?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
Yea, but I got x(x-9), so x=0 and x=9?
nincompoop
  • nincompoop
then put that as your answer and see if it is correct. though I think it is wrong
anonymous
  • anonymous
y=x(x-9), there's no zero so those above weren't it
nincompoop
  • nincompoop
|dw:1378604246266:dw|
anonymous
  • anonymous
Thank you, you didn"t have to.
anonymous
  • anonymous
Where did the 9/2 come from?
nincompoop
  • nincompoop
complete the square take half of b then square it (9/2)^2
anonymous
  • anonymous
So it wouldn't be x^2-9x?
anonymous
  • anonymous
Just x-9x+(9/2)^2
nincompoop
  • nincompoop
x^2 - 9x + (9/2)^2 = -20 + (9/2)^2
anonymous
  • anonymous
x^2+9x+81/4=-1/4 becomes x^2+9x+82/4 becomes x^2+9x+41/2
nincompoop
  • nincompoop
-1/4?
anonymous
  • anonymous
Sorry, I did it wrong 20-81/4 equals -40 1/4. Add that to each side it becomes x^2+9x+60 1/2 =0.
nincompoop
  • nincompoop
81/4 - 20
anonymous
  • anonymous
Do I use the quadratic formula?
nincompoop
  • nincompoop
you don't have to use quadratic formula but you can if you want to
anonymous
  • anonymous
@Data_LG2 Is this the right eqaution x^2+9x+60 1/2 (mixed number) =0?
anonymous
  • anonymous
give me a sec. to read all of these..
anonymous
  • anonymous
I think it's supposed to be -9x instead of positive 9x.
anonymous
  • anonymous
nin is right..this is my method...almost same x=a, y=-20 -20=x^2-9x 0=x^2-9x+20 then factor x^2-9x+20...
anonymous
  • anonymous
So x=4 and x=5?
anonymous
  • anonymous
Thank you for all you've done.
anonymous
  • anonymous
Thank you so much @nincompoop for all you have done. I appreciate it greatly! Thank you for being there as long as you were.
anonymous
  • anonymous
yes, you are right:)

Looking for something else?

Not the answer you are looking for? Search for more explanations.