1) x=-12/12
x=-1
2) x(2x-6)=0; x=0 или x=3
3) D=7^2; x1,2=(-3+-7)/2= -5; -2
4) x= +-5/3
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Answers & Comments
1) x=-12/12
x=-1
2) x(2x-6)=0; x=0 или x=3
3) D=7^2; x1,2=(-3+-7)/2= -5; -2
4) x= +-5/3