Which of the following expressions CANNOT be equal to 0 when x^2 − 8x = 15?	Options.
A) x^2 − 3x B) x^2 − 3x -10 C) x^2 − 4x +5 D) x^2 − 4x - 5 E) x^2 − 2x - 3
x^2 − 8x = 15   x^2 − 8x - 15= 0   x=3 or x=5   All other choices result in a possibility of 0 when you plug in 3 or 5 for x   Except x^2 − 4x +5   Answer is x^2 − 4x +5
<result>C</result>
Which of the following expressions CANNOT be equal to 0 when x^2 − 8x = 15?