The answer would be A: (x-3)(x-3)
Explanation: (X-3)(X-3) would create three new numbers: x^2, -6x, and 9,
(-6x is created because x*-3 + x*-3 = -3x + -3x, or -6x)
9, as you know, is 3*3 or -3*-3
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