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Multimea solutiilor ecuatiei 3(2x-5) la 2 -64=83

Răspuns :

3(2x-5)² -64=83
3(2x-5)²=83+64
3(2x-5)²=147
(2x-5)²=147:3
(2x-5)²=49
2x-5=√49

2x-5=7    2x=12  x=6

2x-5=-7  2x =-2  x=-1