Factor completely x^3-2x^2-8x+16

a. (x+2)(x^2+8)

b. (x-2)(x^2+8)

c. (x+2)(x^2-8)

d. (x-2)(x^2-8)
plz

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

How do i i solve this equation? -18 = x/3 + 3

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]