book Maths Puzzle Numerical Ability

How is (2a+4)(a-3)-(2a+4)(2a-1)completely factored to get -2(a+2)(a+2)as the answer?

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I need your help on changing word phrases to mathematical sentences, I need your answers as soon as possible. What is the turning point, and focus of y= 1/4x2? Also what is its directrix?