Find All X-Intercepts of the Function $$f ( x ) = x ^ { 4 } - 21 x ^ { 2 } + 80$$

question 35

Multiple Choice

Find all x-intercepts of the function.
- $$f ( x ) = x ^ { 4 } - 21 x ^ { 2 } + 80$$

• A) \[( 4,0 ) , ( \sqrt { 5 } , 0 )\]
• B) \[( \pm 4,0 ) , ( \pm \sqrt { 5 } , 0 )\]
• C) \[( \pm 4,0 ) , ( \pm \mathrm { i } \sqrt { 5 } , 0 )\]
• D)(16, 0), (5, 0)

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