2 2 3*(x - 5) + 10*x - 8*x
3*(x - 5)^2 + 10*x - 8*x^2 при x = 1
3*(x - 5)^2 + 10*x - 8*x^2
3*((1) - 5)^2 + 10*(1) - 8*(1)^2
3*(1 - 5)^2 + 10 - 8*1^2
50
3.0*(-5.0 + x)^2 + 10.0*x - 8.0*x^2
2 75 - 20*x - 5*x
/ 2 \ -5*\-15 + x + 4*x/