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# FP1 help! [+ rep] watch

1. Can someone explain how I would do part b in the attachment? I'm going crazy!!!
Can some genius please enlighten me!
Attached Files
2. 63.doc (119.0 KB, 64 views)
3. Bump!
4. (Original post by Narik)
Bump!
Well you know that xy=c^2 then y=c^2/x. Sub that into the normal equation, rearrange and you'll have a quadratic in x which you can hopefully solve.
5. (Original post by ukdragon37)
Well you know that xy=c^2 then y=c^2/x. Sub that into the normal equation, rearrange and you'll have a quadratic in x which you can hopefully solve.
Yeah I tried that, but I don't get a bloomin' quadratic!

(c^2)/x = (t^2)x + (c/t) - ct^3

Now what!?
6. factorise the x terms

Spoiler:
Show
7. (Original post by Narik)
Yeah I tried that, but I don't get a bloomin' quadratic!

(c^2)/x = (t^2)x + (c/t) - ct^3

Now what!?
Now multiply both sides by x and do you not have a quadratic in x?
8. (Original post by KeineHeldenMehr)
factorise the x terms

Spoiler:
Show
I'm sorry but could you give me the next step!
9. (Original post by Narik)
I'm sorry but could you give me the next step!
Move tc^2 to other side and use quadratic formula. (Or complete the square if you prefer)
10. (Original post by ukdragon37)
Move tc^2 to other side and use quadratic formula. (Or complete the square if you prefer)
That's like impossibel to solve!

...for me anyway!

ooh no wait! i got it! halleluljah!!

and i must add...

****ing s*** was that hard!

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