1.

I reduced it to:

But I don't know what to do after that.

2.Find equations of all tangent lines to the graph of

I took the derivative of the equation, which was:

I then thought I might need to make the derivative equal to the original equation, so:

But I don't really know...

3.Determine values of constant real numbers a, b so that the function:

if

if x is greater than -1

is differentiable at x=-1.

No idea how to do this one.