exam Maths Puzzle Numerical Ability

x to the 2nd + 7x + x to the 2nd - 4x
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x to the 2nd - 5x x to the 2nd - 5x

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I do not understand the fromula that I must use to solve the equation. My teacher has failed to explain it to me. I was no there for the notes and there are none to copy because he Find the focus and directrix of the parabola with the given equation.
y2 = -32x