Answer: 
Step-by-step explanation:
The equation of the circle in center-radius form is:

Where the point
is the center of the circle and "r" is the radius.
Subtract 56 from both sides of the equation:

Make two groups for variable "x" and variable "y":

Complete the square:
Add
inside the parentheses of "x".
Add
inside the parentheses of "y".
Add
and
to the right side of the equation.
Then:

Rewriting, you get that the equation of the circle in center-radius form is:

You can observe that the radius of the circle is:

The undefined term is C.) Plane. In geometry, the three undefined terms are point, line, and plane. Defined terms, such as angle or circle, can be defined based on the combination of undefined terms.
Hope the explanation helped!
4a^2c^2(a^2-b^2+c^2)^2
First, solve the exponent around the quantity. Being that it's a power of a power, you would multiply all the exponents inside the parentheses by two. So, after that, it would be:
4a^2c^2(a^4-b^4+c^4)
Then, you would multiply what's outside the parentheses with every term within the parentheses:
(4a^6c^2)-(4a^2c^2b^4)+(4a^2c^6)
Now, you think you can take it from here, or do you need me to keep going?
Answer:

Step-by-step explanation:
Given


--- a point on the parabola
Required
The equation
First, calculate the equation from the zeros

Substitute
and 


To solve for k, we substitute



Divide by -4


So, the equation is:


Answer: K= 5
Step-by-step explanation: Hope this helps! :)