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Maths-

General

Easy

Question

The abscissae of the points, where the tangent to curve $gamma equals x to the power of 3 end exponent minus 3 x to the power of 2 end exponent minus 9 x plus 5$ is parallel to $x$ ‐axis, are

$0$ and $0$
$x = 1$ and -1
x=1 and -3
x=-1 and 3

The correct answer is: x=-1 and 3

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