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Find the scale factor

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]

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9