Math Is Fun Forum

Identity

Member

Registered: 2007-04-18

Posts: 934

Test Question

I was wondering if anyone would like to have a go at this question from my test and post the answers, because I'm still wondering if I got them right. Thanks.

octonion

Member

Registered: 2007-06-11

Posts: 6

Re: Test Question

a) The coordinates of C are:
(k ; 16-k^2)
The coordinates of D are:
(-k ; 16-k^2)

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And(we will) take upon's the mystery of things,
As if we were God's spies.
King Lear

octonion

Member

Registered: 2007-06-11

Posts: 6

Re: Test Question

b) the area is

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And(we will) take upon's the mystery of things,
As if we were God's spies.
King Lear

octonion

Member

Registered: 2007-06-11

Posts: 6

Re: Test Question

C)possible values for k

(although strictly speaking 0 is not a forbidden value for k)
What do you think?

Last edited by octonion (2007-06-13 01:45:27)

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And(we will) take upon's the mystery of things,
As if we were God's spies.
King Lear

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: Test Question

I think that to be consistent, you either have to accept all of -4, 0 and 4, or exclude them all.

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Why did the vector cross the road?
It wanted to be normal.

Identity

Member

Registered: 2007-04-18

Posts: 934

Re: Test Question

Sorry, there was an extra part to that question

What values can k take if the rectangle exists?

octonion

Member

Registered: 2007-06-11

Posts: 6

Re: Test Question

If the rectangle exists, the values that cancel the area are " forbidden".
Then

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And(we will) take upon's the mystery of things,
As if we were God's spies.
King Lear