book Maths Puzzle Numerical Ability

How do you do m=1 f(3)=6

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book Other Question

Factor completely: 6z^3-27z^2+12z

Is it 3z(2z-1)(z-4)? If "i" is imaginary number and u=2-5i v=5+2i and w=-9+7i then consider the equation ux+v=w. where x = ?