# Thread: Need Help Finding Domain and Range, Multiple Choice

1. ## Need Help Finding Domain and Range, Multiple Choice

Determine the domain and the range of the function
f(x)=x²+4x+9

A)Domain: (-∞, -2], Range:[5,∞)

B)Domain: (-∞,∞) Range: (-∞,∞)

C)Domain:[5,∞) Range: (-∞,∞)

D)Domain: (-∞,∞), Range:[5,∞)

Thank you.

2. Originally Posted by beachbunny619
Determine the domain and the range of the function f(x)=x²+4x+9
A)Domain-∞, -2], Range:[5,∞)
B)Domain-∞,∞) Range-∞,∞)
C)Domain:[5,∞) Range-∞,∞)
D)Domain-∞,∞), Range:[5,∞)
The domain of any polynominal is the set of real numbers: $\displaystyle \left( { - \infty ,\infty } \right)$.
For this one the miminum is at $\displaystyle x=-2$.

3. Originally Posted by Plato
The implied domain of any polynominal is the set of real numbers: $\displaystyle \left( { - \infty ,\infty } \right)$.
For this one the miminum is at $\displaystyle x=-2$.
I'd suggest adding the red word to avoid confusion by novices when they meet questions that define a polynomial over a restricted domain ....