Question

How do you find the first five terms given `a_1=9` and `a_(n+1)=2a_n-4`?

Answer 1

Please see the explanation for steps leading to an answer

Explanation:

I recommend that you use an Excel Spreadsheet.

Enter 9 into cell A1

Enter `"=2*A1 - 4"` into A2

Use Excel's clipboard to copy the formula in A2 and paste it into cells A3 through A5.

You will observe the following numbers in cells A1 through A5:

9
14
24
44
84

If you want more terms, copy and paste the formula into more cells.