What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of -12

Explicit formula is:

aₙ = 4(-3)ⁿ⁻¹

The domain of the above formula is:

-∞<n<∞

Step-by-step explanation:

The explicit equation can be found by using the formula

aₙ = a₁ (r)ⁿ⁻¹

Where

a₁ is the first term and

r is the common ratio

We are given a₁ = 4 and a₂ = -12

r = -12/4 = -3

So, explicit formula is:

aₙ = 4(-3)ⁿ⁻¹

The domain of the above formula is:

-∞<n<∞

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this