Y=(x+5) (x+4) in vertex form of parabola

Step-by-step explanation:

The vertex form of an equation of a parabola y = ax² + bx + c:

(h, k) - verex

We have:

           use FOIL (a + b)(c + d) = ac + ad + bc + bd

a = 1, b = 9, c = 20

For k, put the value of h to the equation y = (x + 5)(x + 4):

Finally:

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).