neither of those is in simplest radical form... you SHOULD KNOW how to convert (see your COPIOUS notes or pg 682). Just like variables, you can only combine LIKE RADICALS.
When you multiply (aka simplify) 1/2 times 1/3, do you "cross multiply"? OF COURSE NOT.
So why would you apply that technique to the multiplication (aka simplification) of an algebraic fraction.
USE EASIER EXAMPLES TO GUIDE YOUR PROBLEM SOLVING!!
"Cross Multiplication" is a technique used to solve equations (equations have equal signs and you try to SOLVE them), in particular, proportions. We discussed this in class awhile ago... "cross multiplication" is simply the act of multiplying both sides of an equation by the same value TWICE.
Your confusion is the VERY REASON I hate short-cuts. You need to do problems the long way and understand how the "tricks" work... or else more complex problems like #25 will get you every time!
This Blog exists for the collective benefit of all algebra students. All questions are welcome. The more specific your question (including your own attempts to answer it) the better.
EVEN MORE WELCOME ARE ANSWERS FROM FELLOW STUDENTS. BLOG ON!
i dont know how to start 17. I tried distributing but when i finished i checked my answer and got a different answer than the book.
ReplyDeleteI<3ME!
yeah distributing for #18=FRRRPPPPPPPPP. idk how to do it
ReplyDeleteand for the ec how long does it have to be???
ReplyDeleteWell, for #17 & #18, distribution is the way to go.
ReplyDelete#17)
rad[6](2rad[3] - 4rad[2] becomes
2rad[18] - 4rad[12], right?
neither of those is in simplest radical form... you SHOULD KNOW how to convert (see your COPIOUS notes or pg 682). Just like variables, you can only combine LIKE RADICALS.
#18
rad[2](2rad[2] - 6) becomes
2rad[2]rad[2] - 6rad[2]
you SHOULD KNOW how rad[2]rad[2] (read that as rad[2] times rad[2]) simplifies, SHOULDN'T YOU?
As for the ec... at least a minute, 2-3 would be better... you can have a chorus for goodness sakes... don't you know ANYTHING about music??!!
ReplyDeletethanks mr c
ReplyDeletefor number 25, pg 615, would you cross multiply
ReplyDeleteWhen you multiply (aka simplify) 1/2 times 1/3, do you "cross multiply"? OF COURSE NOT.
ReplyDeleteSo why would you apply that technique to the multiplication (aka simplification) of an algebraic fraction.
USE EASIER EXAMPLES TO GUIDE YOUR PROBLEM SOLVING!!
"Cross Multiplication" is a technique used to solve equations (equations have equal signs and you try to SOLVE them), in particular, proportions. We discussed this in class awhile ago... "cross multiplication" is simply the act of multiplying both sides of an equation by the same value TWICE.
Your confusion is the VERY REASON I hate short-cuts. You need to do problems the long way and understand how the "tricks" work... or else more complex problems like #25 will get you every time!
Mr. C.