Please help and thank you for helping me out

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation