exam Maths Puzzle Numerical Ability

Determine whether the following trinomials is a perfect square. If it is, factor the trinomial.

x^2 - 24x + 48

This problem has me confused and need some help. Thanks.

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exam Other Question

Please answer this question. I do not know how to solve a problem to the -2/3 power. What is the answer to 27^(-2/3) (-2/3) being the exponent A garden is 20 M by 25 M. it is surrounded by a walk-way. the outside perimeter of the walkway is 114 M. What is the width of the walkway?