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# Simple C1 Co-ordinate Geometry Question - Help! watch

1. I'm using the distance formula, I'm confused where the square root of 1+4 came from. Can someone help?
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2. post the question
3. (Original post by Tom__)
post the question
Its part (iii)
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4. (Original post by Jessinoch)
I'm using the distance formula, I'm confused where the square root of 1+4 came from. Can someone help?
Did the question specify what form the answer should be in?
5. If you know where the sqrt49/4 + 49 comes from, the entire thing has just been divided by 12.25 (or 49/4)
6. (Original post by Fractite)
If you know where the sqrt49/4 + 49 comes from, the entire thing has just been divided by 12.25 (or 49/4)
But how do you get 7/2 on the outside of the square root?
7. are you sure you did the previous parts of the question correctly? I got a different answer to you
8. (Original post by Speedbird129)
But how do you get 7/2 on the outside of the square root?
The square root of 12.25 is 3.5, so you use that I think.
9. Surely it would be easier to just do square root of 49/4 + 49 and add them to get square root 61.25. This therefore equals 7 square root 5 divided by 2 which is the same answer??
10. (Original post by Tom__)
are you sure you did the previous parts of the question correctly? I got a different answer to you
Yeah, this is from physicsandmathstutor.com
11. (Original post by Speedbird129)
Surely it would be easier to just do square root of 49/4 + 49 and add them to get square root 61.25. This therefore equals 7 square root 5 divided by 2 which is the same answer??
Yeah but this is C1 so you can't use a calculator
12. (Original post by Speedbird129)
Did the question specify what form the answer should be in?
it said in surd form
13. All they've done is simplify. .
So going one step further the answer is .
14. (Original post by Jessinoch)
I'm using the distance formula, I'm confused where the square root of 1+4 came from. Can someone help?
I assume you know how you get to at which point you know you can factor a 49 out of the expression under the square roots so you get and then you can also factor out a quarter which gets you and then it's just the matter of splitting it into two square roots, one of which square roots nicely into a fraction.

15. (Original post by B_9710)
All they've done is simplify. .
So going one step further the answer is .
Thankyou!
16. (Original post by RDKGames)
I assume you know how you get to at which point you know you can factor a 49 out of the expression under the square roots so you get and then you can also factor out a quarter which gets you and then it's just the matter of splitting it into two square roots, one of which square roots nicely into a fraction.

Thankyou!

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