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(x-2)^2+y^2=36 y=-x+2 The equation a...

`(x-2)^2+y^2=36`
`y=-x+2`
The equation above represent a circle and a line that intersects the circle across its diameter . What is the point of intersection of the two equations that lies in Quadrant II?

A

`(-3sqrt2,3sqrt2)`

B

`(-4,2)`

C

`(2+3,sqrt2)`

D

`(2-3sqrt2,3sqrt2)`

Text Solution

AI Generated Solution

The correct Answer is:
To find the point of intersection of the equations \((x-2)^2 + y^2 = 36\) and \(y = -x + 2\) that lies in Quadrant II, we can follow these steps: ### Step 1: Substitute the line equation into the circle equation We start by substituting \(y = -x + 2\) into the circle's equation \((x-2)^2 + y^2 = 36\). \[ (x-2)^2 + (-x + 2)^2 = 36 \] ### Step 2: Expand the equation Now we expand both squares: \[ (x-2)^2 = x^2 - 4x + 4 \] \[ (-x + 2)^2 = x^2 - 4x + 4 \] Combining these, we have: \[ x^2 - 4x + 4 + x^2 - 4x + 4 = 36 \] ### Step 3: Combine like terms Combine the terms on the left side: \[ 2x^2 - 8x + 8 = 36 \] ### Step 4: Move all terms to one side Now, we move 36 to the left side: \[ 2x^2 - 8x + 8 - 36 = 0 \] \[ 2x^2 - 8x - 28 = 0 \] ### Step 5: Simplify the equation We can divide the entire equation by 2: \[ x^2 - 4x - 14 = 0 \] ### Step 6: Use the quadratic formula Now we apply the quadratic formula \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\), where \(a = 1\), \(b = -4\), and \(c = -14\): \[ x = \frac{-(-4) \pm \sqrt{(-4)^2 - 4 \cdot 1 \cdot (-14)}}{2 \cdot 1} \] \[ x = \frac{4 \pm \sqrt{16 + 56}}{2} \] \[ x = \frac{4 \pm \sqrt{72}}{2} \] ### Step 7: Simplify the square root Since \(\sqrt{72} = 6\sqrt{2}\): \[ x = \frac{4 \pm 6\sqrt{2}}{2} \] \[ x = 2 \pm 3\sqrt{2} \] ### Step 8: Determine the x-coordinate in Quadrant II In Quadrant II, \(x\) must be negative. Therefore, we take: \[ x = 2 - 3\sqrt{2} \] ### Step 9: Find the corresponding y-coordinate Now we substitute \(x\) back into the line equation \(y = -x + 2\): \[ y = -(2 - 3\sqrt{2}) + 2 \] \[ y = -2 + 3\sqrt{2} + 2 \] \[ y = 3\sqrt{2} \] ### Step 10: Write the point of intersection Thus, the point of intersection in Quadrant II is: \[ (2 - 3\sqrt{2}, 3\sqrt{2}) \] ### Final Answer The point of intersection of the two equations that lies in Quadrant II is: \[ \boxed{(2 - 3\sqrt{2}, 3\sqrt{2})} \]
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