If the equation x^2+y^2-10x+14y=-70 is graphed in the xy-plane, it forms a circle. What is the radius of the circle?


 


 

Comments (2)

must remember completing the square requires to add not subtract. -25+-49+-70 = -144 the negative I was thinking something imaginary. Too much imagination. That perfect square caught my attention and I thought 12= square root of 144

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