book Maths Puzzle Numerical Ability

(-6 + 2) / (2 + 2) how do i work it ?
Thank You

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book Other Question

I am asked to find the distance between the verticies of the graphs of f(x)=2(x+4)^2-3 and g(x)= -(x+1)^2-3. According to the form f(x)= a(x-h)^2+k the vertex is (h,k). So the vert Simplify (2x-4)(4x-2)

This is what I've done. Is this correct?
(2x*4x)(-4*-2)=8x+8