If f(x) = 5x - 1, find the following f(a-2)
f(a number or expression) = right hand side
just means to substitute that number or
expression for x in the right hand side
and then simplify it:
f(x) = 5x - 1
Erase all the x's and replace them with blanks
f___ = 5_ - 1
Make the blanks long enough to hold (a-2)
f_____ = 5_____ - 1
Put (a-2)'s in the blanks.
f(a-2) = 5(a-2) - 1
Erase the blanks:
f(a-2) = 5(a-2) - 1
Simplify the right side:
f(a-2) = 5a - 10 - 1
f(a-2) = 5a - 11
Edwin
You can put this solution on YOUR website! f(x) = 5x - 1
To get f(a-2), replace 'x' with (a-2).
Then you get, f(a-2) = 5(a-2) - 1 = 5a - 10 - 1 = 5a - 11
