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Question 6, 2.4.23 HW Score: \( 22.22 \%, 2.67 \) of Part 2 of 3 Points: 0 of 1 Write the standard form of the equation and the general form of the equation of the circle of radius r and center ( \( \mathrm{h}, \mathrm{k} \) ). Graph the circle. \[ r=\sqrt{3} ;(h, k)=(4,-2) \] The equation for the circle in standard form is \( (x-4)^{2}+(y+2)^{2}=3 \). (Simplify your answer.) The equation for the circle in general form is \( \square \) . (Simplify your answer.)

Ask by Mills Montgomery. in the United States
Feb 26,2025

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Answer

The general form of the circle's equation is \( x² + y² – 8x + 4y + 17 = 0 \).

Solution

Starting with the standard form given by   (x – 4)² + (y + 2)² = 3, we expand each term to convert this to the general form. 1. Expand (x – 4)²:   (x – 4)² = x² – 8x + 16 2. Expand (y + 2)²:   (y + 2)² = y² + 4y + 4 3. Combine and equate to 3:   x² – 8x + 16 + y² + 4y + 4 = 3   x² + y² – 8x + 4y + 20 = 3 4. Subtract 3 from both sides:   x² + y² – 8x + 4y + 20 – 3 = 0   x² + y² – 8x + 4y + 17 = 0 Thus, the general form of the equation of the circle is   x² + y² – 8x + 4y + 17 = 0. For the graph:  • The circle has a center at (4, –2).  • Its radius is √3, approximately 1.73.  • Plot the center and draw a circle with radius about 1.73 around that point. This completes the answer.

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Mind Expander

To convert the standard form of the circle's equation into the general form, start with the equation \( (x - 4)^{2} + (y + 2)^{2} = 3 \). Expanding this, we have: \[ (x - 4)^{2} = x^2 - 8x + 16 \] \[ (y + 2)^{2} = y^{2} + 4y + 4 \] Combining these yields: \[ x^2 - 8x + 16 + y^{2} + 4y + 4 = 3 \] Now, simplify by moving 3 to the left side: \[ x^2 - 8x + y^2 + 4y + 17 = 0 \] This is the equation in general form. So, the general form of the equation is: \[ x^{2} + y^{2} - 8x + 4y + 17 = 0 \] And there you have it! Your graphical representation of the circle would be centered at the point (4, -2) with a radius of \(\sqrt{3}\), which means the circle would look perfectly round and cozy on your graph! 🎨✨ If you were to plot this circle on a coordinate system, simply locate the center at (4, -2) and then, from this point, measure roughly \(1.73\) units in every direction to sketch the circle’s perimeter. Happy graphing! 📈✍️

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