What you should see in this case is that you have a third degree polynomial because you have three different zeros. We have then that the generic form factorized for a polynomial of third degree is: (x-a) * (x-b) * (x-c) where, a, b, c: real numbers. For our case: (x + 10) * (x + 4) * (x-1) answer: a polynomial function in factored form is (x + 10) * (x + 4) * (x-1)
1 light year = 9.46 x 10^12 km. Therefore how many light years = 5.9 x 10^13?. Do cross multiplication you'll get. 5.9x10^13 / 9.46x10^12 = 6.23 light years. So d is the correct answer.