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:

$$\begin{gathered} a=15\text{ m } \\ {a}^2+64=b^2 \\ b=\sqrt{a^2+64}=\sqrt{15^2+64}=17 \\ x=b-a=17-15=2\text{ m} \end{gathered}$$

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