2 3 - 8*x + 6*x
3 - 8*x + 6*x^2 при x = 1/2
3 - 8*x + 6*x^2
3 - 8*(1/2) + 6*(1/2)^2
3 - 8/2 + 6*(1/2)^2
1/2
3.0 + 6.0*x^2 - 8.0*x
2 3 + 6*x - 8*x