# Homework Help: A triangle and a parabola getting romantic! Help me with this please

1. May 4, 2010

### crouch88

1. The problem statement, all variables and given/known data
Here's the problem: refer to question no. 6

2. Relevant equations
I am not sure :S

3. The attempt at a solution
This, honestly, is a question which I have no clue how to go about...

Thanks...

Last edited by a moderator: Apr 25, 2017
2. May 4, 2010

### Staff: Mentor

Start by drawing the parabola and triangle.

Last edited by a moderator: Apr 25, 2017
3. May 4, 2010

### LCKurtz

All you have to do is figure out the base and height of the triangle. Can you find where the parabola intersects the line? Are there some values of a that don't work? It might help to draw a picture as an example. Try a = 4. Also try a = -1/2.

4. May 4, 2010

### crouch88

Last edited by a moderator: Apr 25, 2017
5. May 4, 2010

### crouch88

okay okay wait wait...

I solve y=a(squared) and y=9*x(squared) - a --- to get two equations
Also when x=0 for the parabola, y=-a right?

Uh okay...could you tell me then what I should do?

OHHH I made a mistake in the diagram...y is not -0.3 ... y=-3

6. May 4, 2010

### LCKurtz

Use the X2 button to do superscripts. So what did you get when you solved

y = 9x2 - a and y = a2?

Can you figure out the base of the triangle and its height?