Use a graphing calculator to approximate the real zeros. Give each zero as a decimal to the nearest tenth.
-$$f ( x ) = 4 x ^ { 3 } + x ^ { 2 } - 20 x - 5$$
A) $- 0.3,2.2 , - 2.2$
B) $0.3,2.2 , - 2.2$
C) $- 4,2.3 , - 2.3$
D) $4,5 , - 5$

Question

Quizplus · Accepted Answer

Using a graphing calculator to approximate the real zeros of the function $f(x) = 4x^3 + x^2 - 20x - 5$, we find that the zeros are approximately $-0.3$, $2.2$, and $-2.2$, rounded to the nearest tenth.

Use a Graphing Calculator to Approximate the Real Zeros f(x)=4x3+x2−20x−5f ( x ) = 4 x ^ { 3 } + x ^ { 2 } - 20 x - 5f(x)=4x3+x2−20x−5

Use a Graphing Calculator to Approximate the Real Zeros $f ( x ) = 4 x ^ { 3 } + x ^ { 2 } - 20 x - 5$