You really should use your calculator for such simple questions instead of posting them on WA . It requires far fewer key depressions and you get your answer quicker. However, since you are obviously incapable of carrying out even such a simple task, and the answer is 18.
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-9
x^2 +9 =x^2 -9 9=-9 No solution
x2-7x-18 (x-9) (x+2) x=9 x=-2 X= either 9 or -2
-2
3x+9/2=9 3x=9-9/2 3x=9/2 x=9/6 x=3/2