Extending square garden

Mrs. Petrová's garden had the shape of a square with a side length of 15 m. After its enlargement by 64 m2 (square), it had the shape of a square again. How many meters has the length of each side of the garden been extended?

Correct result:

x =  2 m

Solution:

a=15 m a2+64=b2  b=a2+64=152+64=17  x=b−a=17−15=2 m

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