Fill in the box with any number that will create a quadratic function with zeros at -1 and 3.

3x^2- __x-9

3x^2 - 6x - 9

Step-by-step explanation:

In order to make the function have zeros at -1 and 3 it needs to factor into:      

To make that:

3x^2 - 6x - 9

(3x - 9)(x + 1)

To check:

3x - 9 + 9 / 3 = 0 + 9 / 3

x = 3

x + 1 - 1 = 0 - 1

x = -1

So, it is correct.  

 3x^2 - 6x - 9

c

step-by-step explanation:

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72