this ones a bit interesting. given a(n) = 5 - 3n consider this:
a(n-1) = 5 - 3(n-1)
= (5 - 3n) + 3 => but a(n) = 5 - 3n, the first term
= a(n) + 3 => subtract 3 from both sides
a(n-1) -3 = a(n)
or
a(n) - a(n-1) -3
you,
mrb
Answer from: Quest
put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.
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