hi all I have a question, and after a few hours of looking in my books I can`t find the answer.

I have the poin (-4,56) and I am asked to show if it is on the parabola, but I just cant remeber or find the solution?

sorry to be a pain

Dave

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- May 2nd 2012, 11:15 AMdavellew69parabola problem
hi all I have a question, and after a few hours of looking in my books I can`t find the answer.

I have the poin (-4,56) and I am asked to show if it is on the parabola, but I just cant remeber or find the solution?

sorry to be a pain

Dave - May 2nd 2012, 11:29 AMmastersRe: parabola problem
- May 2nd 2012, 11:32 AMdavellew69Re: parabola problem
the equation is y+2x^2-7x-4 but I`m not sure what you mean by substuting

- May 2nd 2012, 11:38 AMmastersRe: parabola problem
Sorry, that's not an equation. Is it $\displaystyle y=2x^2-7x-4$? I think it is. Now, substitute your coordinates in for x and y and see if it is true.

$\displaystyle (-4, 56) \Longrightarrow 56 = 2(-4)^2 - 7(-4)-4$

Is that true? If it is, then the point (-4, 56) lies on the parabola. - May 2nd 2012, 11:42 AMdavellew69Re: parabola problem
lol got it, thanks, I must seem a right plonker

- May 2nd 2012, 11:46 AMmastersRe: parabola problem