4х²-20х+25-4х²-6х+6х+9=0
-20х=-34
х=-34/-20
х=1,7
проверка(2*1,7-5)²-(2*1,7-3)(2*1,7+3)=0
-1,6²-0,4*6,4=0
2,56-2,56=0
0=0
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4х²-20х+25-4х²-6х+6х+9=0
-20х=-34
х=-34/-20
х=1,7
проверка(2*1,7-5)²-(2*1,7-3)(2*1,7+3)=0
-1,6²-0,4*6,4=0
2,56-2,56=0
0=0