What is the radius of a circle with the equation x2 + y2 – 14x + 10y = 250?

Answer 1

The equation of circle is .

To change the expression into a perfect square trinomial add (half the coefficient)² and add (half the coefficient)² to each side of the expression.

.

The standard form of circle equation is , where is the center and is the radius of circle.

Compare the with standard form of circle equation.

Here and .

Therefore, the radius of the circle equation is .