2009 Exam 2 MCQ

[sajib_mostofa]

Can anyone help with me with Q2 of the multiple choice. They say there's three pts of intersection but I'm only getting two with the calculator.

[98.40_for_sure]

You're using the solve function aren't you? Graph the two and there's clearly 3.

[sajib_mostofa]

Any reason as to why the solve function gives me two?

[cipherpol]

o_O i used the solve function and got 3

[azn_dj]

How do you graph it???
Using ti-89

[kyzoo]

Any reason as to why the solve function gives me two?

Because two of the intersections are on top of each other (in the same vertical line) so if you solve for "x" you only get 2 values of "x". I think there are three solutions for "y"? I dunno I made the same mistake.

[98.40_for_sure]

Any reason as to why the solve function gives me two?

Because you're solving for the variable x. At the positive X value it comes up, there is TWO y values. So there is TWO intersection points for x, but 3 for y.

[sajib_mostofa]

Ahh yep thanks for that. Quite cheeky..

[sajib_mostofa]

Also for Q7, it asks for the minimum degree but isnt 3 the highest degree?

[azn_dj]

Nope. For Question seven, it says real coefficients, and you have a complex number and a real number.
so instantly you know there must be a complex conjugate to have real coefficients.
Hence the minimum is 3. For more you can just multiply by (z-1) or (z-2) or anything random. So the maximum is well, anything =D

[sajib_mostofa]

Nope. For Question seven, it says real coefficients, and you have a complex number and a real number.
so instantly you know there must be a complex conjugate to have real coefficients.
Hence the minimum is 3. For more you can just multiply by (z-1) or (z-2) or anything random. So the maximum is well, anything =D

Thanks for that. I originally assumed that there were ONLY those three factors that you mentioned.

[3Xamz]

How do you draw more than one conics equation simultaneously (for comparison) in Classpad 330? :O

[Chavi]

How do you draw more than one conics equation simultaneously (for comparison) in Classpad 330? :O

Sketch the graph in parametric form

[jasoN-]

How do you draw more than one conics equation simultaneously (for comparison) in Classpad 330? :O

eg for an ellipsis Form -> Insert, then whatever
Then you want to see a hyperbola on top of it:
Form -> Insert, then type out the equation
instead of clicking on the graph button, highlight the equation and drag it onto the graph (with an ellipsis already present)

[3Xamz]

Sweet as!
Cheers