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Help with a q please! - HSN forum

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Help with a q please!


4 replies to this topic

#1 Allan_r_123

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Posted 21 October 2007 - 03:43 PM

I was helping my girlfriend with some stuff as I got a B last year and am not bad at maths.

However, we stumbled upon what seems to be a really difficult question and I was just wondering if any of you had any ideas on how to tackle it?



Question:

By using gradients find the value of K.

CHEERS

#2 George

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Posted 21 October 2007 - 04:27 PM

I'll not post all the working; the method should be enough to get you going smile.gif

Firstly, find m_\text{QP} - then, since PQR is a right-angle, you can state m_\text{QR}.

You now have the gradient of QR, and one of the points on it, so you can find its equation.

Then put x=5 into that equation, to get the coordinates of R (and k is the y-coordinate).

#3 Allan_r_123

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Posted 21 October 2007 - 04:41 PM

GENIOUS! smile.gif Thank you!

#4 Connor

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Posted 13 December 2007 - 07:06 PM

I was struggling on a question just like this!
But now everything is clear!
Thanks!

Would k=-5?

#5 George

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Posted 16 December 2007 - 05:16 PM

Yes, k=-5 is the correct answer. smile.gif





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