college algebra
posted by Ty .
solve for X
7=7x^210x+6

move the 7 over:
7x^2  10x + 13 = 0
using the quadratic formula,
x = (10 +/ sqrt(100364))/14
= (5 +/ sqrt(66) i)/7 
Write the arithmetic sequence 16,20,24,28,in the standard form:
An.....?