If f(x) = -3 and g(x) = 4x2 + x - 4, find (f+ g)(x).
o a. 4x + x-1
o b. 4x2 + x-1
o c. 4x*x-7
o d. 6x²-7

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

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

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