exam Maths Puzzle Numerical Ability

Find the constant term that should be added to make the following expression a perfect-square trinomial.
x^2 – 6x

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exam Other Question
The expression for figuring a students average test score is p/t, where p is the total points earned on all the tests, t is the number of tests. Find a students average when 396 points are earned on 6 tests. I need help in solving square roots. I cannot figure out how to solve for the square root of 57