tolong bantu jawab yaa,tapi pake caranya ya ka

pertama cari sisi tegak
[tex] \sqrt{ {17}^{2} - {15}^{2} } = \sqrt{289 - 225 } = \sqrt{64} = 8[/tex]
selanjutnya cari (3x-5) cm
[tex] \sqrt{ {6}^{2} + {8}^{2} } = \sqrt{36 + 64} = \sqrt{100} = 10[/tex]
3x-5 = 10
3x = 15
x = 5