Question

Which expression represents f(x) – g(x)?

f(x) = 2x2 – 3x + 4
g(x) = x2 – 4x – 5


A. x2 – 7x – 1


B. x2 – 7x + 9


C. x2 + x – 1


D. x2 + x + 9

Answer 1

First thing you want to do is equal the equations to each other.

2x^2 - 3x + 4 - (x^2 - 4x - 5)

Now all you have to do is simplify.

X^2- 7x -1 (your answer is A.)

Answer 2

A

Explanation:

f(x) – g(x)

Set up the expression.

2x² - 3x + 4 - x² - 4x - 5

Add or subtract the like terms.

2x² - x² -3x - 4x + 4 - 5

x² - 7x -1