Final answer:
The correct factored form of the expression x2n - 10xn + 16 is (xn - 2)(xn - 8), which corresponds to option a).
Step-by-step explanation:
To factor the given expression completely, we need to find two binomial factors that will give us the original trinomial when multiplied together. The given expression is x2n - 10xn + 16. We are looking for two numbers that multiply to 16 (the constant term) and add up to -10 (the coefficient of the middle term).
The factors of 16 that add up to -10 are -2 and -8. Substituting these into two binomials that multiply to the original quadratic expression, we get:
This is the only pair of factors that meet the criteria, so the correct answer would be option a) (xn + 2)(xn - 8).