+0  
 
0
70
5
avatar

(x+2)/4 - (x-1)/5 = 15

Guest Mar 4, 2018
Sort: 

5+0 Answers

 #1
avatar+12266 
+1

Multily everything by 20   to get

 

5(x+4) - 4 (x-1) = 300    expand

5x + 20 - 4x + 4 = 300   combine like terms

x + 24 = 300                  subtract 24 from both sides

x = 276

ElectricPavlov  Mar 4, 2018
 #2
avatar+1958 
+2

I see a minor error in ElectricPavlov's solution. I think this is simply a copying error.

 

After multiplying by the LCM of the denominator on both sides, all existing fractions disappear.

 

5(x+2)-4(x-1)=300

5x+10-4x+4=300

x+14=300

x=286

 

I like to call this error a "flow-through" error. 

TheXSquaredFactor  Mar 4, 2018
 #3
avatar+12266 
+1

YOU are correct X !!!  Thanx for fixin' it   !  cheeky

ElectricPavlov  Mar 4, 2018
 #4
avatar+1958 
0

Don't worry! It happens to all of us! 

 

Here is an example where I fell victim to the "flow-through" error: https://web2.0calc.com/questions/monic-quartic#r1.

 

The question asks for a fourth-degree polynomial with given roots, and, of course, I misread some of the roots. 

TheXSquaredFactor  Mar 4, 2018
 #5
avatar+12266 
0

Wow!   And THAT was a LOT of work ! cheeky

ElectricPavlov  Mar 4, 2018

22 Online Users

New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy