ADVANCED ALGEBRA HELP!!! PLEASE!!!?

OK, that surely a lot of questions. But, I just will give you a hints for a couple of questions. To find a discriminant or D is based from this quadratic equations formula: x(1,2) =( ( -b ± √(b²-4ac) ) / 2a ) and the (b^2-4ac) is a discriminant. If D=0 it means the roots will be twin or same. And if D>0 it mean there will be a 2 different roots, and if D<0 the root will be imaginary.