kak kak tolong dijawab pakai proses

[tex] 3)\sqrt{625} = 25 \\ 725 \div \sqrt{625} = 725 \div 25 = 29 \\ \\ 4) \sqrt{841} = 29 \\ {17}^{2} = 289 \\ {17}^{2} - \sqrt{841} = 289 - 29 = 260[/tex]