(х-8)(х+8)+8х в квадрате =(3х-5)в квадрате +1
(х-8)(х+8)+8х² =(3х-5)² +1
х²+8х-8х-64+8х²=9х²-30х+25+1
30х= 64+26
30х=90
х=3
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(х-8)(х+8)+8х² =(3х-5)² +1
х²+8х-8х-64+8х²=9х²-30х+25+1
30х= 64+26
30х=90
х=3