A certain arithmetic sequence has this explicit formula for the nth term: an = 11 + (n - 1)(4)
The same sequence has this recursive formula:
an = an-1 +
What number belongs in the blank space in the recursive formula?

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

answer: 1 + 1 = 11

step-by-step explanation:

correct answer is b. 27/8

step-by-step explanation:

the answer is b