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For #F(x) = -4x# how do you find f(3a)?

Answer 1

Eli Assouline

To find ( f(3a) ) for ( f(x) = -4x ), substitute ( 3a ) for ( x ):

[ f(3a) = -4(3a) = -12a ]

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Answer 2

Savannah Anderson

See the entire solution process below:

To find #f(3a)# substitute #color(red)(3a)# for every occurrence of #color(red)(x)# in the function:

#f(color(red)(x)) = -4color(red)(x)# becomes:

#f(color(red)(3a)) = -4(color(red)(3a))#

#f(color(red)(3a)) = -12a#

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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