This is pretty easy, because know 3 zeros of a function (3rd degree)

thats why this function has the form

f(x) = a*(x + 3)*(x + 1)*(x - 2)

now u have to find the a

f(4) = a*(4+7)(4+1)(4-2) = 70a = 10

=> a = 1/7

=> f(x) =1/7(x + 3)*(x + 1)*(x - 2)