Is linear or nonlinear?

Answer question above and explain each step : )

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.