y = 2x³-24x+17
y' = 6x²-24
6x² - 24 = 0
6x² = 24
x² = 4
x = ±2, но учитываем только +2
y(0) = 17
y(8) = 2•8³-24•8+17 = 8²(16-3)+17 = 64•13+17
y(2) = 2•8-24•2+17 = 16-48+17 = -32+17 = -15, minimum
