General Equation of a Circle

What is the radius of the circle with this equation x²+y²-10x+8y-23=0?

• 4
• 2
• 8

Tags

CCSS.HSG.GPE.A.1

Find the center and radius of the circle: x²+y²+14x-2=-1

• center= -7,2 radius= 3
• center= -7,0 radius= 7
• center= -4,1 radius= 5

Tags

CCSS.HSG.GPE.A.1

Change the following equation to standard form
x²+y²-4x+12y-8=0

• (x+2)²+(y-6)²=48
• (x-2)²+(y+6)²=48
• (x-6)²+(y-2)²=48
• (x+2)²+(y-6)²=48

Tags

CCSS.HSG.GPE.A.1

What is the center for the circle with this equation x²+y²+4x+6y-36=0?

• (-2,5)
• (2,7)
• (-2,-3)

Tags

CCSS.HSG.GPE.A.1