exam Maths Puzzle Numerical Ability

solve by factoring

56x + x^3 = 15x^2

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exam Other Question

50. A rock is thrown from the top of a tall building. The distance in feet, between the rock and the ground t seconds after it is thrown is given by d= -16t^2-2t+524. How long after the rock is thrown is it 321 feet from the ground? f(x)=x^2-4x+3.
what is the domain and range?
determine if it is odd,even or neither.