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Maths-

General

Easy

Question

If the length of tangents from $left parenthesis a comma b right parenthesis$ to the circles $x to the power of 2 end exponent plus y to the power of 2 end exponent minus 4 x minus 5 equals 0$ and $x to the power of 2 end exponent plus y to the power of 2 end exponent plus 6 x minus 2 y plus 6 equals 0$ are equal then $10 a minus 2 b equals$

$10$
$- 11$
$11$
$- 10$

The correct answer is: $negative 11$

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