math p1

[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]

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?

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

[mz]

ok thankyou !!!