book Maths Puzzle Numerical Ability

Could some one help me understand this problem?

The instructions are to solve the inequality. Find the vertex and intercepts, then graph it:
y = -3x^2 + 6x

Thanks very much

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book Other Question

Please help me solve this : A square has a side of length 9x-2 inches. Each side is shortened by 3 inches. What is the perimeter of the new smaller square? Let A be an mxn matrix for rank r and let {x, ..., xr} be a basis for R(A^T). Show that {Ax,..., Axr} is a basis for R(A).