Thursday, August 13, 2015

What is x if |5x+8|=17?

To solve |5x+8|=1.


If 5x+8
> 0, then |5x+8|=1 would mean 5x+8 = 17.


So 5x =
17-8 = 9.


5x/5 = 9/5 = 1.8.


So
x = 1.8 is the solution.


If 5x+8 < 0, then |5x+8| =
17 would mean -(5x+8) = 17.


Multiply both sides of -(5x+8)
= 17 by -1 and we get:


5x+8 =
-17.


5x = -17-8 = -25.


5x/5 =
-25/5 = -5.


x = -5 is the
solution.


So there are 2 solutions: x= 1.8, or x=
-5.

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