Mary sells homemade jewelry through an online shop. She found that each time she increases the price of each necklace by $2, she sells three fewer necklaces per week. Mary generally charges $12 for each necklace, and she typically sells 30 necklaces per week. The
factored form of the equation below represents the revenue, R(x), after x price increases of $2.
R(x) = (12 + 2x)(30 – 31)

Please help!!