Which of the following expressions CANNOT be equal to 0 when x^2 + 7x = -12 ?
Choose one:
A) x^2 + 2x − 8 B) x^2 − 4x + 3 C) x^2 − 4x − 21 D) x^2 + 2x − 3 E) x^2 +3x − 4
x^2 +7x = -12   x^2 + 7x 12 = 0   x=-3 or x= -4   All other choices result in a possibility of 0 when you plug in -3 or -4 for x except   x^2 − 4x + 3   Answer is x^2 − 4x + 3
<result>B</result>
Which of the following expressions CANNOT be equal to 0 when x^2 + 7x = -12 ?