Q. Check the position of the Point (5,6) with respect to its circle 2x2+2y2+12x−8y+1=0
Convert to Standard Form: Convert the given circle equation into the standard form.The standard form of a circle's equation is (x−h)2+(y−k)2=r2, where (h,k) is the center of the circle and r is the radius.Given equation: 2x2+2y2+12x−8y+1=0Divide the entire equation by 2 to simplify: x2+y2+6x−4y+21=0
Complete the Square:Complete the square for both x and y.For x: Take half of the coefficient of x, square it, and add it to both sides: (x+3)2−9For y: Take half of the coefficient of y, square it, and add it to both sides: (y−2)2−4Now add 9 and 4 to both sides to balance the equation: (x+3)2+(y−2)2=9+4−21
Simplify Equation: Simplify the right side of the equation.9+4−21=13−21=12.5So the equation of the circle in standard form is: (x+3)2+(y−2)2=12.5
Determine Center and Radius: Determine the center (h,k) and the radius r of the circle.From the standard form, we have h=−3, k=2, and r2=12.5.Therefore, the center of the circle is (−3,2) and the radius is 12.5.
Plug in Coordinates: Plug the coordinates of the point (5,6) into the circle's equation to determine its position.Substitute x=5 and y=6 into the standard form: (5+3)2+(6−2)2=12.5Calculate: (8)2+(4)2=12.564+16=12.580=12.5
Compare Results: Compare the result with r2 to determine the position of the point.Since 80 > 12.5, the point (5,6) lies outside the circle.
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