You can put this solution on YOUR website! x^2>=9
x^2-9>0
(x-3)(x+3)>=0
Plot the points 3 and -3 on a number line thus breaking
the number line into three intervals:
x<-3
-3
3
Check a value in each interval to determine whether the
interval values are or are not part of the solution, for
example:
In the interval -3
Then check 0^2>=9
0>=9
This is false so that interval conains no solutions.
Then check a value in each of the other two intervals.
Cheers,
Stan H.
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