exam Maths Puzzle Numerical Ability

Identify the focus and directrix of the parabola whoe equation is

(y-4)squared = -20(x+5)

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exam Other Question

Find the zeroes of the function without using technology:
y=(3^-2(x-4)) -sqrt27 How do you mutiply (4g+3h)(5g-3h) if it is a polynomial?