3
2
1
6
Correct answer is B
At the point where the tangent is parallel to the x- axis, the slope of the curve = 0.
Given: y=x2−4x+3
dydx=2x−4
2x−4=0⟹2x=4
x=2
When x = 2, the tangent of the curve is parallel to the x- axis.
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