book Maths Puzzle Numerical Ability

#1
Graph and solve the system
y<-x2+4 (2 is x cubed,< is less than or equal to)
y>x-2 (> is greater than or equal to)

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book Other Question

Set of all grains of sand in the world.{Infinite Set/Finit% Set} I need to solve by completing the square.

3x squared - 6x = 27

First I would move the 27 to the other side to get
3x squared-6x-27=0

a = 3
B = -6
C = -27

I am not sure what to do now.