Question

WILL GIVE MEDAL + FAN
Which of the following is the root of the equation 4x^2+2x^3+kx+7=0, where k is an integer.
A.2 B.4 C.7/2 D.2/7

Answer 1

2x^3+4x^2+kx+7=0
let roots are a,b,c
sum of roots =a+b+c=-4/2=-2
product of roots=-7/4

Answer 2

abd=-7/4
ab+bc+ca=k/4

Answer 3

sorry
abc=-7/4

Answer 4

Ok the answers is simply to use the Rational Zero Theorem (: