4) 16х² + 40х+25=16х²-56х+49
16х²-16х²+56х+40х=49-25
96х=24
х=0.25
5)х²-17=х²-34х+289
х²-х²+34х=289+17
34х=306
х=9
6)х²+11=х²+22х+121
х²-х²-22х=121-11
-22х=110
х=-5
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4) 16х² + 40х+25=16х²-56х+49
16х²-16х²+56х+40х=49-25
96х=24
х=0.25
5)х²-17=х²-34х+289
х²-х²+34х=289+17
34х=306
х=9
6)х²+11=х²+22х+121
х²-х²-22х=121-11
-22х=110
х=-5