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The equation of a circle is x2 + y2 + 6x + 4y + 10 = 1. What is this equation written in its standard form?

Respuesta :

mathstudent55
You need to complete the square in x and in y,

[tex] x^{2} + y^{2} + 6x + 4y + 10 = 1[/tex]

First, group the x-terms and the y-terms separately.

[tex] x^{2} + 6x + y^{2} + 4y + 10 = 1[/tex]

Move the 10 to the right side by subtracting 10 from both sides.

[tex] x^{2} + 6x + y^{2} + 4y = -9[/tex]

Now complete the square in x and in y.
The constant you need to add to complete each square is the square of half of the coefficient of the x or y term. Make sure to add the constants to both sides of the equation.

[tex] x^{2} + 6x + 9 + y^{2} + 4y + 4= -9 + 9 + 4[/tex]

[tex] (x + 3)^{2} + (y + 2)^{2} = 4[/tex]

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