l x+4 l = 3x

Question

l x+4 l = 3x

tkhunny · Answer

@ryan123345   You just ignored the absolute values.  Very bad.  The fact that you fond a solution is a coincidence, not an accomplishment.

anonymous · Answer

Modulus behaves like this... mod(x) = +x , if x>0 and -x , if x<0 For your case check the cases x+4 >0 and x+4 <0... In Your particular question x+4<0 yields us no solution...

anonymous · Answer

There are two solutions for this question

x + 4 = 3x
4 = 2x
x = 2

and

x + 4 = -3x
4 = -4x
x = -1

tkhunny · Answer

@ritez You ignored the fact that x = -1 is NOT a solution.

anonymous · Answer

x=-1 is NOT the solution ... because it was calculated using x+4<0...

anonymous · Answer

i was going to say it further, yes x = -1 does not exist

tkhunny · Answer

It would have been perfect if you had included the restrictions.

IF x + 4 >= 0 or x >= -4
x + 4 = 3x
4 = 2x
x = 2
2 >= -4, so this is a solution

or

IF x < -4
x + 4 = -3x
4 = -4x
x = -1
-1 > -4, so this is NOT a solution.