Find the domain and range of the quadratic function whose graph is described.
-The minimum is 15 at $x = - 1$.
A) Domain: $( - \infty , \infty )$
Range: $[ 15 , \infty )$
B) Domain: $[ - 1 , \infty )$
Range: $[ 15 , \infty )$
C) Domain: $( - \infty , \infty )$
Range: $( - \infty , 15 ]$
D) Domain: $( - \infty , \infty )$
Range: $[ - 1 , \infty )$

Question

Quizplus · Accepted Answer

The domain of any quadratic function is all real numbers, $( - \infty , \infty )$, because you can input any real number into the function. Since the minimum value is given as 15, the range starts from 15 and goes to infinity, $[ 15 , \infty )$.

Find the Domain and Range of the Quadratic Function Whose x=−1x = - 1x=−1

Find the Domain and Range of the Quadratic Function Whose $x = - 1$