Question 98347
You are stuck because x^2+9 cannot be zero in the Real
Number System.
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Graph y=x^2+9 and you will see it is always above the x-axis.
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Or consider:
If x is Real, x^2 is always greater than or equal to zero;
so if you add 9 the result is always greater that or 
equal to 9.
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Cheers,
Stan H.