Year 12s: what will be the first way you research your future options? >>

Help needed.urgent!

Emerald123

Hey
how do you do q12 iii) on this as maths paper?http://www.mei.org.uk/files/papers/June13/C1_2013_June.pdf

Reply 1

Smaug123

Original post by Emerald123

Hey
how do you do q12 iii) on this as maths paper?http://www.mei.org.uk/files/papers/June13/C1_2013_June.pdf

What have you tried? It's similar to part ii) of that question.

Reply 2

Emerald123

Original post by Smaug123

What have you tried? It's similar to part ii) of that question.

i have tried everything!NOTHING works to get to the answer(scroll down to see the answer).I got everything correct apart from that silly question! :frown:

Reply 3

Smaug123

Original post by Emerald123

i have tried everything!NOTHING works to get to the answer(scroll down to see the answer).I got everything correct apart from that silly question! :frown:

Presumably you've already got that you need to equate

-x+k

with

\dfrac{1}{x-2}

Reply 4

Emerald123

Original post by Smaug123

Presumably you've already got that you need to equate

-x+k

with

\dfrac{1}{x-2}

yh i have done that and have got x^2-X(K+2)+2k+1=0

Reply 5

Emerald123

what shall i do next?confused

Reply 6

Emerald123

Original post by Smaug123

Presumably you've already got that you need to equate

-x+k

with

\dfrac{1}{x-2}

the answers k=0 or 4 but how did they get that?

Reply 7

Smaug123

Original post by Emerald123

yh i have done that and have got x^2-X(K+2)+2k+1=0

This is correct. So (to answer the first part of q12 iii), what are the x-coordinates of the points of intersection?

Reply 8

Emerald123

Original post by Smaug123

This is correct. So (to answer the first part of q12 iii), what are the x-coordinates of the points of intersection?

its a fraction
y = 1/x-2 and y = - x + k .

Reply 9

Smaug123

Original post by Emerald123

its a fraction
y = 1/x-2 and y = - x + k .

Those are the two equations of the curves. What are the x-coordinates of the intersections of those two curves, given that you've already found that they obey

x^2-x(k+2)+2k+1=0

Reply 10

Emerald123

Original post by Smaug123

Those are the two equations of the curves. What are the x-coordinates of the intersections of those two curves, given that you've already found that they obey