Let $f ( x ) = x ^ { 2 } - 9 x + 21$

question 177

Multiple Choice

Let $f ( x ) = x ^ { 2 } - 9 x + 21$ For what value(s) of x is $f ( x ) = 1$ ?

• A) \(x = 7 , x = 8\)
• B) \(x = 8 , x = 9\)
• C) \(x = 5 , x = 4\)
• D) \(x = 6 , x = 7\)
• E) \(x = 5 , x = 6\)

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Greenhouse Gas

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Synthetic organic compounds once widely used in aerosols and refrigeration, known to deplete the ozone layer and contribute to global warming.

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