Use a Graphing Calculator to Approximate the Real Zeros $$f ( x ) = x ^ { 4 } - 7 x ^ { 2 } + 12$$

Multiple Choice

Use a graphing calculator to approximate the real zeros. Give each zero as a decimal to the nearest tenth.
- $$f ( x ) = x ^ { 4 } - 7 x ^ { 2 } + 12$$

A) $1.7 , - 1.7,2 , - 2$
B) $1.7,2$
C) $3 , - 3,4 , - 4$
D) $- 1,2.3,2.3 , - 2.3$