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math p1

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mz:
okay can someone please clear this confusion?
how do we prove that two vectors are perpendicular and how do we prove they are parallel?
and another thing- i am still not so clear about finding the domains and ranges of functions, questions on this topic confuse me...i do know that the range of f(x) is the domain of f-1(x), but how do we find the range in the first place?

nipuna92:
to prove that 2 vectors are perpendicular their dot product is equal to zero

nipuna92:

--- Quote from: mz on May 11, 2010, 12:23:59 pm --- i am still not so clear about finding the domains and ranges of functions, questions on this topic confuse me...i do know that the range of f(x) is the domain of f-1(x), but how do we find the range in the first place?

--- End quote ---

check this http://www.s-cool.co.uk/alevel/maths/functions/introduction-to-functions.html#domain-and-range

mz:
ok thankyou !!!

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