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

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Answer 1 · 2018-03-12T21:05:53

#f(3)=5#

Simply substitute the value of #3# given. In other words, #f(3)# is the function of #f(x)#, however, in this case, #x# is #3#

#f(3)=3(3)-4#

Distribute #3# through the parenthesis

#f(3)=9-4#

Simplify

#f(3)=5#

Answer 2 · 2018-03-12T21:06:54

#f(3)= 5#

How you start the equation is by plugging #3# into both of the #x#'s in the problem to make it:

#f(3) = 3(3) - 4#

Next, you multiply the #3(3)# to get #9# and subtract #4#. So in the end, you leave the #f(3)# and #9 - #4 is #5#, so the #y# in the equation is #5#.

The answer would be written as

#f(3) = 5#