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September 23, 2014

September 23, 2014

Posted by **Alex** on Sunday, August 12, 2012 at 10:41pm.

| x+3 | < 0.01

I know the answer is : (-3.01,-2.99)

Please show me how to solve this type of math problem.

- Algebra -
**MathMate**, Sunday, August 12, 2012 at 10:55pmThe absolute value actually represents two cases, the contents are positive (in which case the absolute value does not do much), or if the contents are negative, then the negative sign is dropped.

Mathematically speaking, the above equation can be broken down to two:

x+3 < 0.01 ....(1)

and

-(x+3) < 0.01 ...(2)

Solving (1) gives us

x < 0.01-3 = 2.99, or

x<-2.99

Solving (2) gives us

-(x+3)<0.01

-x-3<0.01

x>-3-0.01=-3.01

So together, we have

x ∈ (-3.01,-2.99)

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