Thread: parabola 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

Originally Posted by davellew69

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

Hi davellew69,

Do you have the equation of the parabola? If so, substitute the coordinates you have into the equation and see if it makes it true. You really haven't given much detail to work with.

the equation is y+2x^2-7x-4 but I`m not sure what you mean by substuting

Originally Posted by davellew69

the equation is y+2x^2-7x-4

Sorry, that's not an equation. Is it ? I think it is. Now, substitute your coordinates in for x and y and see if it is true.



Is that true? If it is, then the point (-4, 56) lies on the parabola.

lol got it, thanks, I must seem a right plonker

Originally Posted by davellew69

lol got it, thanks, I must seem a right plonker

No worries, mate.