Which expression is equivalent to ? A 2x3+122x^{3}+122x 3 +12 B 2x2+11x+122x^{2}+11x+122x 2 +11x+12 C 2x3+6x2+4x+122x^{3}+6x^{2}+4x+122x 3 +6x 2 +4x+12 D 2x3+8x2+3x+122x^{3}+8x^{2}+3x+122x 3 +8x 2 +3x+12

Step-by-step explanation:

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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