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Alexxandr [17]
3 years ago
9

Please help me, circle chapter. ​

Mathematics
1 answer:
Ad libitum [116K]3 years ago
5 0

Answer:  p = 4, r = 4

<u>Step-by-step explanation:</u>

The equation of a circle is:   (x - h)² + (y - k)² = r²     where

  • (h, k) is the center of the circle
  • r is the radius of the circle

Complete the square:

x² - 10x +  _____   +     y² + py + _____     = -13 + ___ + ___

x² - 10x  + <u> (-10/2)² </u> +     y² + py + <u> (p/2)²</u>     = -13 + <u> (-10/2)² </u> + <u> (p/2)²</u>        

                  (x - 5)²  +     (y + p/2)²                = -13 + 25 + (p/2)²

                        ↓                   ↓                          |_____<u>↓</u>_____|      

                      h = 5              k = -p/2                            r²

Given: (h, k) = (5, -2)

                                          -2 = -p/2

                                          -4 = -p

                                            4 = p

   r² =  -13 + 25 + (p/2)²

       = -13 + 25 + (4/2)²

       = -13 + 25 + 4

       = 16

\sqrt{r^2}=\sqrt{16}

  r  =  4

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