The principle is used to find the number of strings of eight uppercase english letters that start or end with the letters bo (in that order), if letters can be repeated

the dimensions are:

step-by-step explanation:

we want to find the dimensions of a rectangular box with volume of

we factor to obtain;

we rewrite the rightmost factor to obtain;

recall that:

we apply difference of two squares formula to obtain;

hence the dimensions are

a is the right answer