exam Maths Puzzle Numerical Ability

Use two unit multipliers to convery 60 square centimeters to square meters.

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exam Other Question

Find the length of the latus rectum of the parabola with an equation
x^2-6x-8y+25

Work so far:

x^2-6x=8y-25
x^2-6x+9=8y-25
(x-3)^2=8y-25 Find the value of k so that the equation below has the solution set {-5}.

4(x+3)=x(3-k)

so far i have this but my main problem is what is the definition of a solution set?

4x+12=3x-kx minus 3x from each side. x+12/x= -kx/x then -12/x=k