5/7 = x/70 solve the proportion

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]

[tex]5 \times1 \frac{12}{13} [/tex] me

State one method by which you can recognize a perfect square trinomial.