exam Maths Puzzle Numerical Ability

graph function

y=-2xsquared-4x+2

i just dont understand how 2 do this

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exam Other Question

please help to simplify

m^x/3*n^3x

DIVIDED BY

m^2x*n^3x/4 A used car dealer sold two cars and received $560 for each car. One of these transactions amounted to a 40% profit for the dealer, whereas the other amounted to a 20% loss. Show that the dealer�s net profit on the two transactions was $20.