Question

(x – 2)2 + 8x = (х – 1)(1 + х). решите уравнение

Answer 1

(х-2)²+8х=(х-1)(х+1)
х²-4х+4+8х=х²-1
х²-х²-4х+8х=-1-4
4х=-5
х=-5:4
х=-1,25