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

i need help with (2k+1)7. this is distributive property. its usually a number in front of the parenthesis but for this particular problem there is not so i am really confused are these parallel, perpendicular or both?

3y+x=6 and 2y-6x=12