Question 81223
<pre><font size = 5><b>
Given: f(x) = 5x – 1; Find f(a-2)

       f(<font color = "red">x</font>) = 5<font color = "red">x</font> - 1

Just replace every <font color = "red">x</font> you see with <font color = "red">(a-2)</font>

       f(<font color = "red">(a-2)</font>) = 5<font color = "red">(a-2)</font> - 1

then simplify

       f(a-2) = 5a - 10 - 1

       f(a-2) = 5a - 11

That's all there is to it!

Edwin</pre>