Verified answer

Ответ:

a) y''(x) =  48x -14

b) y''(x) = 5(x² +3x)⁴ * (2x +3)

Пошаговое объяснение:

a) y'(x) = (8x³ -7x² +4x -9)' = 24x² -14x +4

y''(x) = (24x² -14x +4)' = 48x -14

b) y'(x) =( (x² +3x)⁵)' = 5(x² +3x)⁴ * (x² +3x)' = 5(x² +3x)⁴ * (2x +3)