# Show that the equation represents a circle by rewriting it in standard form, and

**Question description**

x^{2} + y^{2} + 6x + y + 9 = 0

standard form

center(*x*, *y*) = ( )

radius

x^{2} + y^{2} + x = 0

standard form

center(*x*, *y*) = ( )

radius

x^{2} + y^{2} + 10y + 18 = 0

standard form

center(*x*, *y*) = ( )

radius

x^{2} + y^{2}−8x + 8y + 16 = 0

standard form

center(*x*, *y*) = ( )

radius

x^{2} + y^{2}−2x−2y = 14

standard form

center(*x*, *y*) = ( )

radius

x^{2} + y^{2}−6x + 8y + 21 = 0

standard form

center(*x*, *y*) = ( )

radius

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