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maths C2 URGENT

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halosh92:
plz can anyone solve this!!!!!!!!!!!!!! my head broke!!!!!!!!!!!


the fixed point A has coordinates (8,-6,5) and the variable point P has coordiantes ( t, t , 2t)
a) show that AP^2= 6t^2 - 24t + 125
b) hence find the value of "t" for which the distance AP is least
c) determine this least distance

nid404:
Can u tell which paper this is from...cuz something seems wrong...
the middle term in AP2 should be 12t and not -24t...
if i knw the paper i can cross check

halosh92:

--- Quote from: nid404 on February 21, 2010, 01:27:32 pm ---Can u tell which paper this is from...cuz something seems wrong...
the middle term in AP2 should be 12t and not -24t...
if i knw the paper i can cross check

--- End quote ---

it is a pastpaper question but they put in our C2 skool textbook the year is not written but i think its pretty old.

astarmathsandphysics:
Is f the question correct?

halosh92:

--- Quote from: astarmathsandphysics on February 21, 2010, 02:20:42 pm ---Is f the question correct?

--- End quote ---

i rili have no idea ???

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