What is the vertex of the quadratic function f(x) = (x – 8)(x + 2)?

The vertex is  (3,-25)

Step-by-step explanation:

Quadratic Function has the form:

Lets use distributive property [a(b+c)=ab+ac] to make the equation given into the vertex form. Thus, we have:

Thus,

a = 1

b = -6

c = -16

The x coordinate of vertex is given as:

Putting the points, we have:

Putting x = 3 into the function, we get y-value of vertex:

The vertex is  (3,-25)

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: