Question

f(x)=-7x^3+2x^2-x+2 найти f(x); f(3)

Answer 1

$f(x)=-7x^3+2x^2-x+2\\f'(x)=-21x^2+4x-1\\f'(x)=-21\cdot9+4\cdot3-1=-189+12-1=-178$