exam Maths Puzzle Numerical Ability

Multiply.

(root ( 4, 6 ) - root ( 8, 7 )) (root ( 3, 6 ) + root ( 6, 7 ))

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exam Other Question

5-2(y-5)=27 how do you solve and check that and could you show all steps and give a free ex. please and thank you Find the focus and directrix of the parabola with the given equation.
y2 = -32x