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# Coordinate geometry, is my answer correct? watch

1. c) Point A = (6, -2) and C = (2,k), the distance from point A to C is 5. Find the 2 possible values of the constant k.

My answer: I used the distance formula and substituted the values for point A and C, I then solved to find k, so the 2 values were -5 and +5, is this correct? If not, what can I do to get the correct answer?
2. (Original post by Magenta96)
c) Point A = (6, -2) and C = (2,k), the distance from point A to C is 5. Find the 2 possible values of the constant k.

My answer: I used the distance formula and substituted the values for point A and C, I then solved to find k, so the 2 values were -5 and +5, is this correct? If not, what can I do to get the correct answer?
-5 is a correct value of k but +5 isn't. It sounds like you're using the right method so you may have made a mistake while factorising or something.
3. (Original post by usycool1)
-5 is a correct value of k but +5 isn't. It sounds like you're using the right method so you may have made a mistake while factorising or something.
Hi, thanks for answering, I keep getting this when working out 20 + k^2 = 25, which would make k something weird like root 5, am I supposed to be getting this at some point?
4. (Original post by Magenta96)
Hi, thanks for answering, I keep getting this when working out 20 + k^2 = 25, which would make k something weird like root 5, am I supposed to be getting this at some point?
Can you show all your working?

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