F (x) = 3x^5+7x^3-8x^2-x+23

Simplifying

f (x) = x2 + 8x + - 3

Multiply f * x

fx = x2 + 8x + - 3

Reorder the terms:

fx = - 3 + 8x + x2

Solving

fx = - 3 + 8x + x2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.

f = - 3x-1 + 8 + x

Simplifying

f = - 3x-1 + 8 + x

Reorder the terms:

f = 8 + - 3x-1 + x