exam Maths Puzzle Numerical Ability

Solve this quadratic equation by Extracting square roots:

1. 1=1/3x^2 and
2. x/4=9/x

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PLEASE TRY AND SOLVE THESE QUESTIONS WITH THE INFO GIVEN HERE, i AM COMPLETELY LOST, I WOULDN'T KNOW WHERE TO START, AND SOMETIMES I THINK I AM MADE TO FAIL AT MATH, BECAUSE I ALWA .the area of a square bookcase is 21 more than the perimeter. find the length of a side