book Maths Puzzle Numerical Ability

please help me. I am trying to find the vertex, domain and range of
y = x^2 - 4x. my graph is not coming out right.

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book Other Question

x<5
x>-4
A box contains 2 blue card numbered 1 thought 2, and three green cards numbered 1 through 3. List the sample space of picking a blue card followed by a green card.