Question 52673
<pre><font size = 5><b>I am having trouble with part B of this question.
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let f(x) = <font face = "symbol">Ö</font>2x+6
   A. give the domain of f(x)
2x+6=> 0
2x=> -6
x=>-3

B. find f(a+1)I have no idea where to start with this 
part B? Any help would be appreciated. Thank you
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f(x) = <font face = "symbol">Ö</font>2x + 6

All you have to do is to replace all the <font color = "red">x</font>'s by <font color = "red">a + 1</font> 
and simplify the right side:
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    f(<font color = "red">x</font>) = <font face = "symbol">Ö</font>2<font color = "red">x</font> + 6
            ____________
f(<font color = "red">a + 1</font>) = <font face = "symbol">Ö</font>2(<font color = "red">a + 1</font>) + 6
            __________
f(a + 1) = <font face = "symbol">Ö</font>2a + 2 + 6
            ______
f(a + 1) = <font face = "symbol">Ö</font>2a + 8

Edwin</pre>