Solve the Inequality $x ^ { 4 } - 40 x ^ { 2 } + 144 \geq 0$

question 136

Multiple Choice

Solve the inequality. Graph the solution set and write the solution set in interval notation.
- $x ^ { 4 } - 40 x ^ { 2 } + 144 \geq 0$

• A) \([ - 6 , - 2 ] \cup [ 2,6 ]\)
• B) \(( - \infty , - 6 ] \cup [ - 2,2 ] \cup [ 6 , \infty )\)
• C) \(( - 6 , - 2 ) \cup ( 2,6 )\)
• D) \(( - \infty , - 6 ) \cup ( - 2,2 ) \cup ( 6 , \infty )\)

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