If #f(x) = 6x—3#, what is the value of #f(1)+f(2)#?

1 Answer
Nov 11, 2015

#f(1) + f(2) = 12#.

Explanation:

To get to this answer we have to substitute #x# in #f(x)#by #1# and then by #2#. How? Let's see:

#f(x) = 6x - 3#. So,
#f(1) = 6(1) - 3 = 6 - 3 = 3#,
#f(1) = 3#.
#f(2) = 6(2) - 3 = 12 - 3 = 9#,
#f(2) = 9#.

So, #f(1) + f(2) = 3 + 9 = 12#,
#f(1) + f(2) = 12#.

Hope it Helps! :D .