exam Maths Puzzle Numerical Ability

If f(x)=int(3x), find f(-1.4).

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Please help me, I am lost.
complete the square and write the equation in standard form. Then give the center and radius of the circle:
x^2+y^2-2x-4y-4=0

Thank you so much (2z-3)1/2=9

the (2z-3) is raised to the 1/2 power.