Book Maths Puzzle Algebra

What is the solution set of |3x + 4| <= 7

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Book Other Question

Using the "completing the square" idea how do i come up with 2 solutions for x in terms of a b and c for the equation ax^2+ bx+c=0. Ok so you have 27 cubes that you put into 1 big cube then you paint the sides of the big cube red and then take them apart. Once they are apart how many of the cubes have paint on: 3 faces, 2 faces, 1 face or 0 faces