The slopes of the tangents at the points where the curve  y=x2−4x intersects the x – axis is

# The slopes of the tangents at the points where the curve  $y={x}^{2}-4x$ intersects the x - axis is

1. A

$±1$

2. B

$±2$

3. C

$±3$

4. D

$±4$

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