What needs to be corrected in this construction of a line parallel to passing through C?

Which of the binomials below is a factor of this trinominal? x^2-13+30

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)