1)D=11^2-4×(-4)×3=169=13^2
x1=-11+13/2×3=2/6=1/3
x2=-11-13/6=-4
2)D=7^2-4×3×8=49-96=-47 <0
3x^2+11x-4=0
D=121+48=169
x1=(-11+13)/6=1/3
x2=-24/6=-4
3x^2+11x-4=3(x-(1/3))(x+4)
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Answers & Comments
1)D=11^2-4×(-4)×3=169=13^2
x1=-11+13/2×3=2/6=1/3
x2=-11-13/6=-4
2)D=7^2-4×3×8=49-96=-47 <0
3x^2+11x-4=0
D=121+48=169
x1=(-11+13)/6=1/3
x2=-24/6=-4
3x^2+11x-4=3(x-(1/3))(x+4)