+0  
 
0
99
1
avatar+171 

How to solve this problem?

X2-x-2=4?

BOSEOK  Jul 30, 2017
edited by BOSEOK  Aug 9, 2017
Sort: 

1+0 Answers

 #1
avatar+1224 
+1

Do you mean \(2-x-2=4\)?

 

If so, I will solve it as so:
 

\(2-x-2=4\) Combine the like terms on the left hand side of the equation
\(-x=4\) Divide by -1 on both sides to get rid of the negative on the x.
\(x=-4\)  
   

 

If you are ever unsure if you have the correct value for your unknown, just plug it back into the equation:

 

\(2-(-4)-2=4\) Check to see if this is true; if it is wrong, you either made a mistake or you have an extraneous solution.
\(2+4-2=4\) Subtracting a negative number is the equivalent of adding a positive one.
\(6-2=4\)  
\(4=4\) 4=4 is a true statement and concludes that the value for x is correct.
   
TheXSquaredFactor  Jul 30, 2017

6 Online Users

avatar
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.  See details