Please help!! it's urgent!!

(PART 1)
Write an expression to represent the length of the rectangular space AND simplify your expression. Show all work.

You have a rectangular space where you plan to create an obstacle course for dog training. The area of the rectangular space is represented by the expression 12x² - 32x. The width of the rectangular space is represented by the expression 2x.
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(PART B)
Prove that your answer in Part A is correct by multiplying the length of width of the rectangle. Show all work.