exam Maths Puzzle Numerical Ability

find any rational roots for the equation: x^4 + 3x^3 - x^2 - 9x - 6 = 0

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exam Other Question

suppose that the width of a rectangle is 2 inches shorter than the length and that the perimeter of the rectangle is 80. set up an equation for the perimeter involving only L, the length of the rectangle. Factor each polynomial, if possible cannot be factored ,write prime.

-49r^2+4t^2

and

4c^2-5d^2

If someone could help me with these two i think i can do the rest of my