HELP!!!!!!
Find the domain of the function.f(x) = -2x + 4

A. (-∞, 0) (0, ∞)

B. (-∞, ∞)

C. [-4, ∞)

D. (0, ∞)

Question

HELP!!!!!!
Find the domain of the function.f(x) = -2x + 4

	 A. (-∞, 0) (0, ∞)	

B. (-∞, ∞)	

C. [-4, ∞)	

D. (0, ∞)

lucaz · Answer

domain are the x values you can plug in the equation, -2x + 4 has no restrictions, you can plug in any value, the answer is B

mathmale · Answer

True.  f(x)-2x+4 is a polynomial, and the domain of any polynomial is (-inf, +inf), same as here.

lucaz · Answer

but let's say you have -2x+4/x when x is zero the function is undefined, in this case you can plug in any value except zero, the answer would be A

mathmale · Answer

Right, lucaz, but that's a whole new ball game; you've created a "rational function."

lucaz · Answer

yeah, just in case =P