The roots of the given equation are 5 + 3i, 5 - 3i.
This means the two factors of the given polynomial are x - (5+3i) and x - (5 - 3i). The product of the factors must result in the original expression. So, we can write:
x² - (answer) + 34 = (x - 5 -3i)(x - 5 + 3i) (Equation 1)Simplifying the right hand side:

Thus, we can write the Equation 1 as:
x² - (answer) + 34 = x² - 10x + 34 Comparing the two sides, we can conclude that the answer to this question is 10x.