We want to write an explicit formula of the sequence 7, -28 , 112.
[tex]\frac{-28}{7}=\frac{112}{-28}=-4[/tex]
This is a geometric progression, the first term is 7 and the common ratio is;
The explicit formula is ;
[tex]T_n=ar^{n-1}[/tex]
Therefore, the explicit formula for this sequence is;
[tex]T_N=7(-4)^{N-1}[/tex]
