Answer: Intercept form
Specifically it's the x intercepts that are easily determined.
The factor (x-5) leads to x-5 = 0 and then to x = 5
So because (x-5) is a factor, it means x = 5 is one of the x intercepts.
The other x intercept is x = 8 due to the factor (x-8)
We can't determine the y intercept with this method. To find the y intercept, plug in x = 0 to get y = -80
Side notes:
- Standard form of a parabola is y = ax^2 + bx + c
- Vertex form of a parabola is y = a(x-h)^2 + k where (h,k) is the vertex