If x is positive, and x is decreased by 3, then a^2 - x^2 is a) increased by 6x-9 b) increased by 6x c)decreased by 9 d)increased by 6x+9 e)decreased by 6x-9
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a^2 - (x-3)^2 = a^2 - x^2 + 6x-9
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