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How do you find the value of f(-1), if #f(x)=3x-4#?

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Mar 30, 2017

See the entire solution process below:

Explanation:

To evaluate #f(-1)# we must substitute #color(red)(-1)# for every occurrence of #color(red)(x)# in the function #f(x)#:

#f(color(red)(x)) = 3color(red)(x) - 4# becomes:

#f(color(red)(-1)) = (3 xx color(red)(-1)) - 4#

#f(color(red)(-1)) = -3 - 4#

#f(color(red)(-1)) = -7#

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