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38. For f ( x ) = − x 2 + 5 x − 2 , find the following. Show all of your work. a. f ( − 4 ) b. f ( - b )

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38. For f ( x ) = − x 2 + 5 x − 2 , find the following. Show all of your work.
a. f ( − 4 )
b. f ( - b )

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Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
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For (a) just plug in x = -4 into f(x) and compute the answer. 
 
f(x) = -x2 + 5x -2
f(-4) = -(-4)2 - 5(-4) - 2 = ____?
 
For (b), just replace the x with -b. Some of the signs will change.