Is this a d/dx thing? Just find y'(x), then set it equal to zero.
Or if ur not in calculus yet, use -2b/a. From ax^2+bx+c.
Do u have a specific parabola?
Answer:
The equation that would be used for the zero product property on will be (x-5)(x-10)=0
Option B is correct.
Step-by-step explanation:
We need to solve the equation 
Solving the equation:

Now, we would factorise to find value of x

So, the equation that would be used for the zero product property on will be (x-5)(x-10)=0
Option B is correct.
Answer:
-3.
Step-by-step explanation:
It will be a negative number because you're taking 7 away from 4. You can do 7-4 and it will equal 3, but you flip it, and it will be -3.