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September 2nd, 2016, 03:39 AM  #1 
Newbie Joined: Apr 2016 From: England Posts: 13 Thanks: 2  Having trouble with factoring equations
I've checked many videos and really can't find any covering the equations i'm stuck with. 3xsquared 15x = 0 4xsquared 8x = 0 5xsquared 12x = 0 I understand an equation with two numbers such as xsquared 9x 10 = 0 a lot more than when theres only one number in the equation, as I would normally just find the sum of 9x and the product of 10... I can't do that with just one number from what I can see. Any help would be much appreciated! 
September 2nd, 2016, 04:33 AM  #2 
Senior Member Joined: Feb 2010 Posts: 706 Thanks: 141  Interesting. I went to YouTube, typed in "factoring polynomials" and in less than a second got over 39,000 hits. The first two had problems just like the ones you are asking about.

September 2nd, 2016, 05:19 PM  #3 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 551 
$3x^2  15x = 0 \implies 3x(x  5) = 0 \implies WHAT?$

September 2nd, 2016, 07:44 PM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
It's really a quadratic: 3x^2  15x + 0 = 0 c = 0. Try it! 
September 3rd, 2016, 06:11 AM  #5 
Newbie Joined: Sep 2016 From: Chipping Norton Posts: 5 Thanks: 0 
Well you can still solve the equation... Just like JeffM1 show 3x^215x=0 You can take 3x out of the equation > 3x(x5)=0 3x=0 > x=0; x5=0 > x=5 Hence x=0 or x=5 Sent from my iPhone using Tapatalk 
October 5th, 2016, 11:40 PM  #6 
Newbie Joined: Jun 2016 From: india Posts: 24 Thanks: 4 
3x^(2)−15x=0⟹3x(x−5)=0⟹x=0,x=5 4x^(2)− 8x=0⟹4x(x−2)=0⟹x=0,x=2 5x^(2)−12x=0⟹x(5x−12)=0⟹x=0,x=12/5 Last edited by rahuljoshi; October 5th, 2016 at 11:47 PM. 
October 18th, 2016, 03:48 PM  #7 
Newbie Joined: Oct 2016 From: PA Posts: 1 Thanks: 0  How to Factor
Always try to take out a GCF (biggest factor that they have in common) In this case it's 3x 

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equations, factoring, trouble 
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