I DONT GET how to do function operations?

Question

f(x)=2x^2+x-3 and g(x)=x-1

i need to do f(x) times g(x)

Answer 1

(2x^2 +x -3)* (x -1)

=2x^3 -2x^2  +x^2 -3x -x +4

= 2x^3  -x^2   -4x +4

Answer 2

OK, so you would need to set up the problem first:

1. (2x^2+x-3)(x-1)

2. FOIL Method, first, outside, inside, last

3. First 2x^2*x = 2x^3

4. X*X = x^2

5. -3*x = -3x

6. 2x^2*-1 = -2x^2

7. x*-1 = -x

8. -3*-1 = -3

Combine the terms:

2x^3 + x^2 - 2x^2 - 3x - x - 3

Simplify

2x^3 - x^2 - 4x - 3

Done.  So just do it in steps, every time.