Odpowiedź:
7^2 +4^2 = x^2
49 + 16 = x^2
65 = x^2
sqrt(65) = x
[tex] {4}^{2} + {x}^{2} = (4 \sqrt{10} ) ^{2} \\ 16 + {x}^{2} = 160 \\ {x}^{2} = 144 \\ x = 12[/tex]
prosze bardzo
