Which of the following expressions CANNOT be equal to 0 when x^2 − 2x = 3?
Choose the correct choice from the following choices.
A) x^2 − 6x + 9
B) x^2 − 4x + 3
C) x^2 − x − 2
D) x^2 − 7x + 6
E) x^2 − 9
E. Can x^2 − 9 = 0?   Factor to get (x + 3)(x - 3) = 0   So, (x + 3) = 0 or (x - 3) = 0   ELIMINATE E   D. Can x^2 − 7x + 6 = 0   Factor to get (x - 1)(x - 6) = 0   So, (x - 1) = 0 or (x - 6) = 0   Since we cannot conclude that (x - 3) = 0 or (x + 1) = 0, the correct answer must be x^2 − 7x + 6
<result>D</result>
Which of the following expressions CANNOT be equal to 0 when x^2 − 2x = 3?