Ответ:
1)
3(3х+1) + 5(2х-3)= 45
9х+3+10х-15=45
19х-12=45
19х=57
х=3
2) 7х²+42х=6х-6
7х²+36х+6=0
х1= -18 + √282/7
х2= -18-√282/7
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Answers & Comments
Ответ:
1)
3(3х+1) + 5(2х-3)= 45
9х+3+10х-15=45
19х-12=45
19х=57
х=3
2) 7х²+42х=6х-6
7х²+36х+6=0
х1= -18 + √282/7
х2= -18-√282/7