exam Maths Puzzle Numerical Ability

2x2 + 3xy -4y2 when x=2 and y=4 i would like to know how they got (-80)
if any one can break it down this is from a sample test for college online

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Hi I hope this is for the correct topic I have a word problem.I have seperated the equation w=3.14n+87.1 I think that is the waste generated? However I am really confused word prob In parallelogram LMNO, an exterior angle at vertex O measures 72 degrees. Find the measure, in degrees, of L. First I made a diagram of a parallelogram and label LMNO. I have no id