4y times -y. this is simple i just forgot the rule for it

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Which two undefined geometric terms always describe figures with no beginning or end?