PLEASE HELP. MELODY OR CPHILL

Note that the first  few terms are

7,  -28,  112, - 448  ......

So....the first term, a₁,   is   7

And the a_n term is  given  by   -4 (a_n-1)

So....the rule is

a_n  = -4 (a _n-1),   a₁  = 7