My Math Forum  

Go Back   My Math Forum > Math Forums > Math

Math General Math Forum - For general math related discussion and news


Reply
 
LinkBack Thread Tools Display Modes
January 12th, 2016, 03:46 PM   #1
Member
 
Joined: Mar 2015
From: KY

Posts: 35
Thanks: 1

Cross Products

My sons algebra class again... Any help in solving the problems is greatly appreciated.

scsims is offline  
 
January 12th, 2016, 04:21 PM   #2
Math Team
 
Joined: Dec 2013
From: Colombia

Posts: 7,502
Thanks: 2511

Math Focus: Mainly analysis and algebra
b) is incorrect. You are trying to prove the Cross Product property so you can't use it in the proof. You have simply multiplied both sides of the equation by the same number $\displaystyle bd$.

d) is the associativity of multiplication.
e) multiplies numbers by their multiplicative inverses
f) multiplies by the multiplicative identity.

For 2) you have $\displaystyle {b \over j}=\frac45$ and $\displaystyle {b +8 \over j+8}=\frac67$ which should be straightforward to solve.

3) is entirely similar, having negative signs in place of the plus signs.
v8archie is offline  
Reply

  My Math Forum > Math Forums > Math

Tags
cross, products



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cross Side! Denis Algebra 2 October 6th, 2012 10:48 AM
Cross Product aaron-math Calculus 1 February 6th, 2012 03:44 PM
Cross-sectional average? natterer Advanced Statistics 1 June 25th, 2010 02:02 PM
cross multiplication jackson Elementary Math 10 December 18th, 2009 07:41 AM
cross product [a]x dimevit Linear Algebra 2 October 18th, 2007 04:45 AM





Copyright © 2018 My Math Forum. All rights reserved.