math help please!

Question

let y=4x^2-4x+3

a) find the question to the tangent line to the graph at x=2

b) find the point, on this graph at which tangent line is horizontal line

Answer 1

The answers to these questions depend on the derivative which is 8x - 4

The equation of the tangent is 12=(y-11)/(x-2)

and the tangent is horizontal when the derivative = 0.