Find the sum of the roots of the polynomial P(x)=2x4−7x3+x2+6x+5P(x) = 2x^4 - 7x^3 + x^2 + 6x + 5P(x)=2x4−7x3+x2+6x+5 using Vieta's formulas.
3.53.53.5
−3.5-3.5−3.5
0.50.50.5
−0.5-0.5−0.5