Medina Allan
10/05/2023 · Senior High School
Find the intercepts of the circle. \( (x-2)^{2}+(y+7)^{2}=9 \) Select the correct choice below and, if necessary, fill in the answer box within your choice. A. The \( x \)-intercept(s) is/are (Use a comma to separate answers as needed. Tyere is no \( x \)-intercept. Select the correct choice below and, if necossary, fill in the answer box within your choice. A. The \( y \)-intercept(s) is/are (Use a comma to separate answers as needed. Type an exact answer, using radicals as needed.) B. There is no \( y \)-intercept.
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Step-by-step Solution
To find the intercepts of the circle given by the equation \((x-2)^{2}+(y+7)^{2}=9\), we will first identify the center and radius of the circle.
The equation is in the standard form \((x-h)^{2} + (y-k)^{2} = r^{2}\), where \((h, k)\) is the center and \(r\) is the radius.
From the equation:
- The center \((h, k)\) is \((2, -7)\).
- The radius \(r\) is \(\sqrt{9} = 3\).
### Finding the \(x\)-intercepts:
To find the \(x\)-intercepts, we set \(y = 0\) and solve for \(x\):
\[
(x-2)^{2} + (0 + 7)^{2} = 9
\]
\[
(x-2)^{2} + 49 = 9
\]
\[
(x-2)^{2} = 9 - 49
\]
\[
(x-2)^{2} = -40
\]
Since the square of a real number cannot be negative, there are no \(x\)-intercepts.
### Finding the \(y\)-intercepts:
To find the \(y\)-intercepts, we set \(x = 0\) and solve for \(y\):
\[
(0 - 2)^{2} + (y + 7)^{2} = 9
\]
\[
4 + (y + 7)^{2} = 9
\]
\[
(y + 7)^{2} = 9 - 4
\]
\[
(y + 7)^{2} = 5
\]
Taking the square root of both sides, we have:
\[
y + 7 = \sqrt{5} \quad \text{or} \quad y + 7 = -\sqrt{5}
\]
Solving for \(y\):
1. \(y + 7 = \sqrt{5} \Rightarrow y = \sqrt{5} - 7\)
2. \(y + 7 = -\sqrt{5} \Rightarrow y = -\sqrt{5} - 7\)
Thus, the \(y\)-intercepts are:
\[
y = \sqrt{5} - 7, \quad y = -\sqrt{5} - 7
\]
### Summary of Intercepts:
- The \(x\)-intercept(s) is/are: **There is no \(x\)-intercept.**
- The \(y\)-intercept(s) is/are: **\(\sqrt{5} - 7, -\sqrt{5} - 7\)**.
Quick Answer
The \(x\)-intercept(s) is/are: There is no \(x\)-intercept.
The \(y\)-intercept(s) is/are: \(\sqrt{5} - 7, -\sqrt{5} - 7\).
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