(a) Substitute the given values of x to get the y-coordinates of P and Q. Then use the distance formula.

(b) Find dy/dx and calculate its value at x = 1 and x = 2. What do you notice and therefore conclude ...? (To get the derivative, you should note that ).

(c) From (b) you know the gradient of the tangent. The gradient of the normal is -1/(gradient of tangent). From (a) you have a known point on the tangent. Use these two things to get the equation of the tangent as you would any line.