Answer:
Option C. 
Step-by-step explanation:
we know that
The discriminant of a quadratic equation of the form
is equal to

in this problem we have
so

substitute



The circumference is 12.56cm and the area is 12.56cm
Answer:
the length would be 12.
Step-by-step explanation:
The best way for him to check his answer would be to simply plug in the value found for x into the equation.
4(2) - 6 = 2
8 - 6 = 2
2 = 2