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What is the center of a circle represented by the equation [tex]\((x+9)^2+(y-6)^2=10^2\)[/tex]?

A. [tex]\((-9, 6)\)[/tex]
B. [tex]\((-6, 9)\)[/tex]
C. [tex]\((6, -9)\)[/tex]
D. [tex]\((9, -6)\)[/tex]


Sagot :

To find the center of the circle represented by the equation [tex]\((x + 9)^2 + (y - 6)^2 = 10^2\)[/tex], we need to understand the standard form of a circle's equation.

The standard form of a circle's equation is:
[tex]\[ (x - h)^2 + (y - k)^2 = r^2 \][/tex]
where [tex]\((h, k)\)[/tex] is the center of the circle and [tex]\(r\)[/tex] is the radius.

Given the equation:
[tex]\[ (x + 9)^2 + (y - 6)^2 = 10^2 \][/tex]

We can rewrite the equation in the standard form by recognizing the shifts in the [tex]\(x\)[/tex] and [tex]\(y\)[/tex] coordinates.

1. The term [tex]\((x + 9)^2\)[/tex] can be rewritten as [tex]\((x - (-9))^2\)[/tex]. This indicates that the [tex]\(x\)[/tex]-coordinate of the center is [tex]\(-9\)[/tex].

2. The term [tex]\((y - 6)^2\)[/tex] matches the standard form [tex]\((y - k)\)[/tex], where [tex]\(k = 6\)[/tex].

Therefore, the center [tex]\((h, k)\)[/tex] of the circle is [tex]\((-9, 6)\)[/tex].

Thus, the correct answer is:
[tex]\[ (-9, 6) \][/tex]
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