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16. Tangents and Normals
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Q1 of 149 Page 16

Find the point on the curve y = x2 – 2x + 3, where the tangent is parallel to x-axis.

Given curve y = x2 – 2x + 3


We know that the slope of the x-axis is 0.


Let the required point be (a, b).


∵ the point lies on the given curve


∴ b = a2 – 2a + 3 ….(1)


Now, y = x2 – 2x + 3



Slope of the tangent at (a, b) = 2a – 2


According to the question,


2a – 2 = 0


⇒ a = 1


Putting this in (1),


b = 1 – 2 +3


⇒ b = 2


So, the required point is (1, 2)


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Questions · 149
16. Tangents and Normals
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