maths question help

Hi, could someone help me with this question please?

I worked out the coordinate as (2,27)
Differentiated to get y =10x
Not sure what to do now.
Answer is y = 20x - 13

As its just a parabola, you could sketch the curve/tangent line and that may help you think about out, but the tangent is a line so you need the gradient "m" (at the tangent point) and a point (maybe the tangent point) on the line to get "c" ...

sorry, not sure what you mean. Don’t I have to differentiate?

Hi, could someone help me with this question please?

I worked out the coordinate as (2,27)
Differentiated to get y =10x
Not sure what to do now.
Answer is y = 20x - 13