The Student Room Group

How to find constants of quadratic equation given the coordinates.

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Reply 20
Original post by Jyashi
Yes i do.
Lol feel like im getting married.


Now multiply both sides by 2x2x, what do you get? :biggrin:

:rofl: :rofl:
Reply 21
Original post by Zacken
Now multiply both sides by 2x2x, what do you get? :biggrin:

:rofl: :rofl:


AAAAAAAAAHHHHHHHHH......

5 million years later

hhhhhhhhh.
I get as you said .
Screenshot_2016-03-02-20-38-07.jpg
Reply 22
Original post by Jyashi
AAAAAAAAAHHHHHHHHH......

5 million years later

hhhhhhhhh.
I get as you said .
Screenshot_2016-03-02-20-38-07.jpg


You're missing the dydx\frac{dy}{dx}, but I think you've gotten it. :biggrin:

To recap:

dydx=12x2xdydx=2x2x2xdydx=x2xdydx=y\displaystyle \frac{dy}{dx} = \frac{1}{2\sqrt{x}} \Rightarrow 2x \frac{dy}{dx} = \frac{2x}{2\sqrt{x}} \Rightarrow 2x \frac{dy}{dx} = \sqrt{x} \Rightarrow 2x\frac{dy}{dx} = y
Reply 23
Original post by Zacken
You're missing the dydx\frac{dy}{dx}, but I think you've gotten it. :biggrin:

To recap:

dydx=12x2xdydx=2x2x2xdydx=x2xdydx=y\displaystyle \frac{dy}{dx} = \frac{1}{2\sqrt{x}} \Rightarrow 2x \frac{dy}{dx} = \frac{2x}{2\sqrt{x}} \Rightarrow 2x \frac{dy}{dx} = \sqrt{x} \Rightarrow 2x\frac{dy}{dx} = y


Yes that explains it perfectly. Sometimes you just need some Zacken in your head to see things more clearly.
Reply 24
Original post by Jyashi
Yes that explains it perfectly. Sometimes you just need some Zacken in your head to see things more clearly.


Awesome, I'm off to bed now - see you around. :-)

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