Find the zeros of the function?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax