Use a graphing calculator to find, approximately the range of the function. $f ( x ) = 2 x ^ { 4 } - x ^ { 3 } + x ^ { 2 } + 2 x - 7$
A) $[ - 2,7 )$
B) $( - \infty , \infty )$
C) $[ - 14 , \infty )$
D) $[ - 7 , \infty )$
E) $[ - \infty , 7 )$

Question

Quizplus · Accepted Answer

Using a graphing calculator to graph the function, we can see that the range appears to be from $-7$ up to infinity. We can also observe that the function is increasing as $x$ approaches infinity, which supports this range. Therefore, the best choice is D, $[-7,\infty)$.

Use a Graphing Calculator to Find, Approximately the Range of the Function