Write the coordinates of the point at which the tangent to the curve y = 2x2 – x + 1 is parallel to the line y = 3x + 9.

Let (a, b) be the required coordinate.


Given that the tangent to the curve y = 2x2 – x + 1 is parallel to the line y = 3x + 9.


Slope of the line = 3


the point lies on the curve


b = 2a2 – a + 1 … (1)


Now, y = 2x2 – x + 1



Now value of slope at (a, b)



Given that Slope of tangent = Slope of line


4a – 1 = 3


4a= 4


a = 1


From (1),


b = 2 – 1 +1


b = 2


1