book Maths Puzzle Numerical Ability

Identify all rational zeros of the polynomial function f(x)= x^3+4x^2-2x-15

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book Other Question

i need to know how to convert feet into sq.yds.(surface measurements)
example:A=46ft.x13ft. what do i do next?
am i right to say the total sq. ft. of the area would be 46X2 by 13X2? I need to understand how to solve this equation and to find the value of x.
4x+x+(4x-20)+(2x-10)=1,202