exam Maths Puzzle Numerical Ability

Find the length of a side of a square whose area is the same as that of a rectangle 24 cm. by 30 cm.

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HELP ME!!!!!

you need the book you cannot type the question Multiply.

(x- 1/3)(x+ 1/3)

x minus one-third multiplied by x plus one-third

I am not sure how to begin