My Math Forum  

Go Back   My Math Forum > High School Math Forum > Pre-Calculus

Pre-Calculus Pre-Calculus Math Forum


Thanks Tree2Thanks
  • 2 Post By skipjack
Reply
 
LinkBack Thread Tools Display Modes
February 23rd, 2019, 05:57 AM   #1
Senior Member
 
Joined: Dec 2015
From: iPhone

Posts: 433
Thanks: 67

Need explanation

Just give the hint .
(1) If $\displaystyle a+b+c=0 \; $ and $\displaystyle a\neq b \neq c\; $ a,b,c real numbers .
Show that $\displaystyle \frac{a^2 }{bc +2a^2 } +\frac{b^2 }{ac+2b^2 } +\frac{c^2 }{ ab+2c^2 }=1$ .

(2) Factorize the polynomial : $\displaystyle x^7 +x^5 +1$ .
idontknow is offline  
 
February 23rd, 2019, 09:52 AM   #2
Global Moderator
 
Joined: Dec 2006

Posts: 20,370
Thanks: 2007

(1) Replace $a$ with $-(b + c)$ throughout the left-hand side of the equation to be proved.

(2) Try to find a quadratic factor.
Thanks from topsquark and idontknow
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Pre-Calculus

Tags
explanation



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need some explanation Vaki Calculus 7 April 7th, 2014 04:12 PM
Need some explanation about (sin x)' rain Calculus 3 July 19th, 2013 11:21 PM
Need explanation!!! daivinhtran Algebra 5 July 24th, 2011 11:54 AM
Could use a better job of explanation Male_volence Calculus 2 February 13th, 2008 04:20 AM
Need some explanation about (sin x)' rain Real Analysis 3 December 31st, 1969 04:00 PM





Copyright © 2019 My Math Forum. All rights reserved.