Question 1144236
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As Alan said,  plug in  "z+3"  instead of  "x"  at every occurrence of  "x".



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In the given case, it works this way:


    f(z+3) = 2*(z+3)^2 + 4*(z+3) - 1.


Next, you must simplify it.


It is simple job, and I leave it to you to complete it.
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In order for to get full understanding, &nbsp;you should complete it on your own at least once.


If you want, &nbsp;you can post your answer to the forum - somebody of the tutors will verify it . . . 


If you do, &nbsp;then refer correctly to &nbsp;<U>THIS</U> &nbsp;post.


For it, &nbsp;you may use the ID number of the post, &nbsp;which &nbsp;(the &nbsp;ID &nbsp;number) &nbsp;is &nbsp;1144236.