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Grace [21]
3 years ago
15

Find the center and the radius of the circle with the equation:

Mathematics
1 answer:
nekit [7.7K]3 years ago
5 0

Answer:

(x+1)^2 + (y-1)^2 = 16

And the general formula for a circle is given by this expression:

(x-h)^2 +(y-k)^2 = r^2

With the center (h,k) and the radius r. If we compare this general expression with the formula that we obtain in (1) we see that :

h = -1, k =1 , r =4

So then the best solution for this cae would be:

b. center: (-1,1)

radius =4

Step-by-step explanation:

For this case we have the following equation given:

x^2 +2x + y^2 -2y -14=0

And we can complete the squares for this case like this:

x^2 +2x +(2/2)^2 +y^2 -2y +(2/2)^2 =14 +1+1

(x^2 +2x +1) +(y^2 -2y +1) =16

Now we can rewrite the last expression like this:

(x+1)^2 + (y-1)^2 = 16

And the general formula for a circle is given by this expression:

(x-h)^2 +(y-k)^2 = r^2

With the center (h,k) and the radius r. If we compare this general expression with the formula that we obtain in (1) we see that :

h = -1, k =1 , r =4

So then the best solution for this cae would be:

b. center: (-1,1)

radius =4

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