Question

Please help

Let f(x)=2x^2+x-3 and g(x)=x-1.
Perform the indicated operation, then find the domain.
(F-g)(x)

A. X^2-4; domain: positive real numbers
B. 2x^2-4; domain: all real numbers
C. X^2-4; domain: all real numbers
D. 2x^2-2; domain: all real numbers

Answer 1

@mathmath333
@mathmate

Answer 2

Can you do the (F-g)(x) part?

Answer 3

No:/, that's why I posted the question on here @mathmate

Answer 4

(f-g)(x) = f(x)-g(x)
so you would subtract the polynomial g(x) from f(x).

Answer 5

In case of need, you can use the following link to help you, it is easy to read and full of examples:
http://www.purplemath.com/modules/polyadd2.htm

Answer 6

gtg.
two more things that will help you:
1. Sum and difference of polynomials are polynomials.
2. All polynomials have a domain of real numbers, i.e. \((-\infty,\infty)\)