exam Maths Puzzle Numerical Ability

Please help w/ the following:

2x^-2+3x^-1+1=0

Thank you.

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6-(-5r)=5r-3 I didnt understand this.. could you help me out?

A right triangle has a leg of length x and a hypotenuse of 2x. Write an equation to find the lengt s of the other leg and use i