Quadratic equation homework problem

  • #1
198
0

Homework Statement



y^2 - 2y = x^3 + 2x^2 + 2x + 3

Homework Equations





The Attempt at a Solution



Solve for y
How do you solve for y? my book says since that equation is quadratic in y, it can be solved as y = 1 +- sqrt(x^3 + 2x^2 + 2x + 4) but I have no idea how to do that...

all I can do is y(y-2) ...
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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Can you express [itex]y^2-2y[/itex] in the form [itex]a(y+h)^2+k[/itex]?
 
  • #3
198
0
Thanks for your reply
y^2 - 2y - K = 0
-k, -2y
K = x^3 + ....
Unfortunately, i seem unable to do so
 
  • #4
198
0
Oh wait, I forgot about completing the square, I got it thanks
 
  • #5
disregardthat
Science Advisor
1,866
34
You can also use the quadratic formula, might be easier.
 

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