exam Maths Puzzle Numerical Ability

factoring: quadratic equations and completing the square
a^6-4a^3-21=0

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exam Other Question

1/3(s-2)=s +4

I first distribute, and I got s/3-2/3=s +4
I added 2/3 and ended up with s/3= 14/3 is this right or am I missing a step? find the constant of variation k.
m varies directly with n; m - 144 when n = 8.