Question

F(x)=-7x^3+2x^2-x+2 найти f(x); f(3)

Answer 1

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

Answer 2

To find f(x) from the given function F(x), you just need to replace the variable x with the function's argument, which in this case is f(x). Let me do the substitution:

Given function: F(x) = -7x^3 + 2x^2 - x + 2

Replace x with f(x): F(f(x)) = -7(f(x))^3 + 2(f(x))^2 - f(x) + 2

Now, to find f(3), simply substitute x = 3 into the function:

f(3) = F(f(3)) = -7(f(3))^3 + 2(f(3))^2 - f(3) + 2

Without further information about the function f(x) or any additional equations/conditions, we cannot calculate the specific value of f(3) at this point.