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If anyone could teach me how to do these sort of questions it would be much appreciated.

1. Find all points of contact of horizontal tangents to the curve

y=2√x+1/√x

2. Find equation of tangent to

y=1-3x+12x²-8x³

which is parallel to the tangent at (1,2)

3. The normal to the curve

y=a√x+b/√x

where a and b are constants, has equation 4x+y=22 at the point where x=4. Find the values of a and b.

I havent had much trouble with other work in the chapter, but I have continously got questions similar to this wrong. Some help would be much appreciated.