MATHS QN PLEASE HELP OR ELSE (INSERT KNIFE EMOJI) (1 Viewer)

[Average Boreduser]

Bruh I dont get in part alpha we can just sub in x and y from the parametric eqn. I tried using other examples and found that the roots don't actually equate if we took the cartesian and equated that way?
Am I wrong for thinking out the box from where I stay?
Am I wrong for saying that I'll choose another way?

 

[cossine]

View attachment 43581
Bruh I dont get in part alpha we can just sub in x and y from the parametric eqn. I tried using other examples and found that the roots don't actually equate if we took the cartesian and equated that way?
Am I wrong for thinking out the box from where I stay?
Am I wrong for saying that I'll choose another way?

It would be good if you could provide the working out.

 

[Average Boreduser]

kk one sec

 

[Average Boreduser]

OHHHH SHITE NO NVM NVM I saw why (just wrote it down and realised my prob)

For any1 wondering what I was confused about, it was basically how I tried equating a general parametric to a curve and I was trying to prove if it gacve the same roots as if you just subbed the parametric x,y into the curve directly. I found t and then realised I still needed to convert it back to x to find the actual roots.

 

[liamkk112]

View attachment 43581
Bruh I dont get in part alpha we can just sub in x and y from the parametric eqn. I tried using other examples and found that the roots don't actually equate if we took the cartesian and equated that way?
Am I wrong for thinking out the box from where I stay?
Am I wrong for saying that I'll choose another way?

u can sub in the parametric into the cartesian equation of the parabola because you are finding where the line intersects the parabola to find A and B, and from part i) finding what t gives A and B will be the length of PA and PB respectively, just make sure you try to do what everybody else doing just cause everybody doing what they all doing

 

[Average Boreduser]

u can sub in the parametric into the cartesian equation of the parabola because you are finding where the line intersects the parabola to find A and B, and from part i) finding what t gives A and B will be the length of PA and PB respectively, just make sure you try to do what everybody else doing just cause everybody doing what they all doing

tysm

 

[Average Boreduser]

Guys honestly, this is a huge reminder to everyone- note :If one thing you know, how far would you grow?
you're walking down this road of yours, this road that you call home

 

[ivanradoszyce]

Hi,

As a matter of curiosity, where did this question come from?

 

[Average Boreduser]

Hi,

As a matter of curiosity, where did this question come from?

Its a past paper form sydney boys 2022. q14

 

[ivanradoszyce]

Thanks.... I like the question!