book Maths Puzzle Numerical Ability

x^4-5x^3+12x^2-5x-2
factorise it

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book Other Question

A car moving at 50km/h skids 15m with locked brakes. How far will the car skid with locked brakes at 150km/h? I have one more problem! Interest is compounded annually. Find the amount in the account after the given length of time. round to the nearest cent. HERE THE PROBLEM! PRINCIPAL $400