So for the point (3,5) you can use the equation we found from the derivative to calculate the slope at that point.
*substitute your slope from the derivative in for m
Then substitute this equation back into your original equation for y.
Get everything on one side and then find your x values either by factoring or quadratic formula.
This will give you two x values on the two tangent lines. You can simply plug each of these into your slope equation m = 2x and that will give your their slopes.
Using this info, see if you can work out the second one. Hope that helps!