Combine the radicals

Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Aphrase is shown read the phrase and give me the answer