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2007 AMC 10B Question 2

AMC10 · 2007 AMC 10B

Question 2

Define the operation $\star$ by $a\star b = (a+b)b.$ What is $(3\star 5)-(5\star 3)?$
  1. $-16$
  2. $-8$
  3. $0$
  4. $8$
  5. $16$