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anonymous
 one year ago
Can someone please check my answers ?? i will fan and medal(:
Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit.
x2 + 2x + y2 + 4y = 20
anonymous
 one year ago
Can someone please check my answers ?? i will fan and medal(: Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit. x2 + 2x + y2 + 4y = 20

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0(Xh)^2 + (y  K)^2 = r^2 (x^2 + 2x + 1) + (y^2 + 2(2y) +4) = 20 + 1 + 4 (perfect squares) Next step is easy: you compare (x+1)^2 + (y+2)^2 = 5^2 with the standard form of the circle with centre (h,k) and radius r (xh)^2+(yk)^2 = r^2 and decide what the values of h, k and r are. From (y+2) = yk, subtract y from both sides, so yy+2 = yyk or 2=k, multiply by 1 to get 2=k, so we have h=1, k=2, and r=5 From the standard equation of a circle, (xh)^2+(yk)^2=r^2 we therefore found center = (h,k)=1,2, and radius = r =5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@zepdrix @jim_thompson5910

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I think you meant to say center = (1,2)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1if so, you have the correct answer

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah i did my bad , but is everything in the right order and everything ? and seem correct @jim_thompson5910

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1everything else looks perfect. Nice work

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1you're welcome
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