х²-16=0
х²=16 х₁=4 х₂=-4
х²+5х+4=х²+4х+х+4=х(х+4)+(х+4)=(х+4)(х+1)
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х²-16=0
х²=16 х₁=4 х₂=-4
х²+5х+4=х²+4х+х+4=х(х+4)+(х+4)=(х+4)(х+1)