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# FP3 vectors help ! watch

1. I don't understand how they did 2b. Where did they get root(1+9) from?

Q http://www.examsolutions.net/papers/...P3C.pdf?x65970

MS http://www.examsolutions.net/papers/...CMS.pdf?x65970
2. (Original post by FHL123)
I don't understand how they did 2b. Where did they get root(1+9) from?

Q http://www.examsolutions.net/papers/...P3C.pdf?x65970

MS http://www.examsolutions.net/papers/...CMS.pdf?x65970
Factorise

3. (Original post by NotNotBatman)
Factorise

im still confused over this
4. (Original post by FHL123)
im still confused over this
actually its just clicked now- thanks !
5. (Original post by FHL123)
im still confused over this
Try

sqaure root ( (Y sqaured) +(C x (Y sqaured) ), where Y = 10 - (a squared)

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