Solve the equation |2x − 5| £ 9
recall that |n| =
n if n>=0
-n if n<0
So, we have two possibilities.
If 2x-5 >= 0,
2x-5 = 9
x = 7
If 2x-5 < 0,
-(2x-5) = 9
2x-5 = -9
x = -2
So, x = -2,7
n if n>=0
-n if n<0
So, we have two possibilities.
If 2x-5 >= 0,
2x-5 = 9
x = 7
If 2x-5 < 0,
-(2x-5) = 9
2x-5 = -9
x = -2
So, x = -2,7