Find the constant k so that : -x2 - (k + 9)x - 8 = -(x - 2)(x - 4) Choose the correct choice from the following choices
A) 11
B) 12
C) 15
D) 14
E) 19
-x2 - (k + 9)x - 8 = -(x - 2)(x - 4) : given   -x2 - (k + 9)x - 8 = -x2 + 6x - 8   -(k + 9) = 6 : two polynomials are equal if their corresponding coefficients are equal.   k = -15 : solve the above for k   correct answer 15
<result>C</result>
Find the constant k so that : -x2 - (k + 9)x - 8 = -(x - 2)(x - 4)