Find the coordinates of the centre of the circle .
Answer and explanation
Correct answer: C.
- Step 1: Compare with : the centre is .
- Step 2: Here and , so the centre is .
Answer
.
Why not the others: is what you get if you forget to change the signs. is what you get if you read off the coefficients and with the wrong sign. is what you get if you swap the coordinates.
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