How many tangents are parallel to x-axis for the curve\[y={{x}^{2}}-4x

1.	How many tangents are parallel to x-axis for the curve\[y={{x}^{2}}-4x+3\]?
A.	1
B.	2
C.	3
D.	No tangent is parallel to x-axis
Answer» B. 2

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How many tangents are parallel to x-axis for the curve\[y={{x}^{2}}-4x+3\]?

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