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# Vectors help!!! watch

1. Stuggling with part cii, found vector BP, and then used distance formula to find a quadratic in mu, and found mu to be 5/3 and 1/3 but that is wrong, why do you have to do vector PB thought it did not matter which one you do. Thanks

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2. (Original post by Jimmy20002012)
Stuggling with part cii, found vector BP, and then used distance formula to find a quadratic in mu, and found mu to be 5/3 and 1/3 but that is wrong, why do you have to do vector PB thought it did not matter which one you do. Thanks

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It doesn't matter which one you do. I got -5/3, -1/3 for mu.
3. (Original post by ghostwalker)
It doesn't matter which one you do. I got -5/3, -1/3 for mu.
So I got 5/3 and 1/3, is that wrong? Where have I gone wrong?

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4. (Original post by Jimmy20002012)
So I got 5/3 and 1/3, is that wrong? Where have I gone wrong?

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In working out the vector BP.

Consider the first coordinate. It's 6 - (8+2u) = -2 -2u, not 2u-2.

Similarly the others.

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