exam Maths Puzzle Numerical Ability

please help me solve this:

(x - 2y)(x + 2y)

thank you.

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exam Other Question

Can you please help me with these questions?
a) sq. rt. of 12 plus sq.rt. of 108
b) ^3 sq. rt. of 16 times ^3 sq. rt. of 3
Thank you so much for your help. a motor boat goes 3 miles upstream in the same time required to go 5 miles downstream.if the rate of flow of river is 3 miles per hour,find the speed of the motorboat in still wate