Find the equation of a circle whose center is at (-2, 5) and whose radius is 7 units.
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Answer:
x²+ y²+4x-10y-20= 0
Step-by-step explanation:
just use the standard form of equation.
(x-h)² + (y- k)² = r²
(h,k) is center and r is radius.
(x-(-2))² + (y- 5)² = 7²
(x+2)² + (y- 5)² = 7²
x²+4x+4 + y²-10y+25= 49
x²+ y²+4x-10y= 20
x²+ y²+4x-10y-20= 0
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