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2007 AMC 10BProblem 2P1-10~1 minPrint
FunctionsSet up the equation/formula and compute; no special trick needed

Define the operation ⋆\star by a⋆b=(a+b)b.a \star b = (a+b)b. What is (3⋆5)−(5⋆3)?(3 \star 5) - (5 \star 3)?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.