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Use the Values a b and c to find the roots of the following quadratic equation .
1.x^2+4x+3=0
2.6x^3+12x-18=0
3.x^2+4x-21=0

Sagot :

1.) a= 1; b= 4; c =3
2.) a= 6 ;b=12; c=-18
3.) a= 1 ; b=4 ; c=-21