Sal finds the center and the radius of a circle whose equation is x^2+y^2+4x-4y-17=0, and then he graphs the circle.
Equation of a circle in non-factored form is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSG.GPE.A.1.
1. HSG.GPE.A.1 : Derive the equation of a circle of given center and radius using the Pythagorean Theorem; complete the square to find the center and radius of a circle given by an equation.
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