Question

Find the sum of the roots to the equation: \[2x^3-13x^2+27x-28=0\]
A. -1.5
B. -0.5
C. 6.5
D. 7.5

Answer 1

try expanding this to see what happens - it might give you a clue:\[(x-r1)(x-r2)(x-r3)\]where r1, r2 and r3 are the 3 roots of this equation (but leave them as r1, r2, r3).

Answer 2

C. \[\frac{13}{2}=6.5 \]