Book Maths Puzzle Algebra

I have a equation.

(x+1) exponent is 2/5 - 3(x+1) exponent is 1/5 - 2=0

I know how to get to the answer replacing (x+1)1/5 with U to the 2nd power, but I don't understand w

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Book Other Question

Using y = Ax^2 + Bx + C

find the coordinates of the max/min point. you may want to put the form in
y=(x-h)^2+k

also, what determines if the point is a max or a min? (by the A triangle encloses a circle, is tangent to it at three points and the circle has a radius of three. we need the area of one region of the triangle outside the circle.