9y^2+6y+1=0
D=36-4×9=36-36=0
x= -6/9= -2/3
3x^2-7x+4=0
D=49-4×4×3=49-48=1
x1= 7+1/6= 8/6= 4/3= 1 1/3
x2= 7-1/6= 6/6= 1
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9y^2+6y+1=0
D=36-4×9=36-36=0
x= -6/9= -2/3
3x^2-7x+4=0
D=49-4×4×3=49-48=1
x1= 7+1/6= 8/6= 4/3= 1 1/3
x2= 7-1/6= 6/6= 1