Step-by-step explanation:

is a root of the quadratic

This quadratic isn't factorable so use the quadratic formula

The plus and minus sign after b means we going to have two roots.
The roots are

and

We subsitue those values for Beta.
27a.

27b.
25
In a direct proportion, the equation can be set up as
y = kx
k = y/x
k = 6/20
k = 0.3