Problem: The sum of all the roots of 4x3−8x2−63x−9=0 is:
Answer Choices:
A. 8
B. 2
C. −8
D. −2
E. 0
Solution:
S=−(−8/4)=2;
or
find one root, -3 , by trial. The reduced equation is 4x2−20x−3=0, where the sum of the roots is 5.∴S=5−3=2.