AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!

# Help Before Finals!!!

3 posts / 0 new
Offline
Joined: Dec 2010
Help Before Finals!!!

Few things i need help with before my Alg II honors final. i need a decent grade on this thing. thanks

Lol so first thing......Solving Complex expressions and quadratic equations and wiritng them in the form a+bi???
-i know what i is, but i dont understand everything about how to solve stuff with it, and what the standard form a+bi means

Ex: sqrt(-4) * sqrt (-4)

Ex: 6x^2-48x+192=0

and then...the functions where there are 2 of them at once bracketed by a { ??? if you go to graph them, do u just graph them both seperately? and are these the same as piecewise defined functions?

No examples of this that i can find

theres something about functions thats in the form f(a+h) - f(a), all of that over h?......how do u solve these?

then finally, could someone walk me thru doing long division with expressions? i understand synthetic division, but the long stuff loses me

Ex: 6x^3 + 6x^2 +12x/
3x^2+4

??? lol you dont have to answer everything, any help is appreciated

thanks

Offline
Joined: Nov 2010

well sqrt(-4) is just 2i, this process involves taking the negative out so for example sqrt(-225) is just 15i and you leave your answer as that
for your 2nd problem 6x^2-48x+192=0 take it step by step you can either do qud form
(x= (plus or min) (-b*sqrt(b^2-4ac))/2a or you can make it a perfect squared.
6x^2-48x= -192 sub 192 from both sides
x^2-8x= -32 divide by 6
x^2-8x+16= -16 divide 8 by 2 then square the 4 you get then add to both sides
(x-4)(x-4)=-16
(x-4)^2= -16
x-4= 4i
x=4i+4
x= 4i-4 this is because when u take the sqroot of somthing u plus or minus it
HOPE THIS HELPS im only a jr in hs In Calc 2 so PM if u need help with other things

Offline
Joined: Sep 2013

well sqrt(-4) is just 2i, this process involves taking the negative out so for example sqrt(-225) is just 15i and you leave your answer as that
for your 2nd problem 6x^2-48x+192=0 take it step by step you can either do qud form
(x= (plus or min) (-b*sqrt(b^2-4ac))/2a or you can make it a perfect squared.
6x^2-48x= -192 sub 192 from both sides
x^2-8x= -32 divide by 6
x^2-8x+16= -16 divide 8 by 2 then square the 4 you get then add to both sides
(x-4)(x-4)=-16
(x-4)^2= -16
x-4= 4i
x=4i+4
x= 4i-4 this is because when u take the sqroot of somthing u plus or minus it
HOPE THIS HELPS im only a jr in hs In Calc 2 so PM if u need help with other things

## Need Help?

We hope your visit has been a productive one. If you're having any problems, or would like to give some feedback, we'd love to hear from you.

For general help, questions, and suggestions, try our dedicated support forums.

If you need to contact the Course-Notes.Org web experience team, please use our contact form.

## Need Notes?

While we strive to provide the most comprehensive notes for as many high school textbooks as possible, there are certainly going to be some that we miss. Drop us a note and let us know which textbooks you need. Be sure to include which edition of the textbook you are using! If we see enough demand, we'll do whatever we can to get those notes up on the site for you!