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How to solve this problem?

X2-x-2=4?

 Jul 30, 2017
edited by BOSEOK  Aug 9, 2017
 #1
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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.
   
 Jul 30, 2017

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