1)х²+13х-17=х²-7x+28
13х+7х = 28+17
20х = 45
х = 2,25
2)х²+22х+121=0
(х+11)² = 0
х+11 = 0
х = -11
3)3-х=х-3
3+3 = х+х
6 = 2х
х = 3
1)х²+13х-17=х²-7x+28
13х+7х = 28+17
20х = 45
х = 2,25
2)х²+22х+121=0
(х+11)² = 0
х+11 = 0
х = -11
3)3-х=х-3
3+3 = х+х
6 = 2х
х = 3