Areas between curves

  • Thread starter fk378
  • Start date
  • #1
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Homework Statement


Find the area between
x=2(y^2) and x+y=1



The Attempt at a Solution


First I'm trying to find their intersection so

To solve for y I set up:
2(y^2)=1-y
2(y^2)+y=1
y=0,1

But, I notice that my teacher did:
2(y^2)+y-1=0
(2y+1)(y-1)=0
y=-1, 1/2

Why are these 2 methods bringing about different answers? Shouldn't they be the same?
 

Answers and Replies

  • #2
Dick
Science Advisor
Homework Helper
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Don't double post.
 

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