An equation with a discriminant that is less than zero.
Note that in getting the discriminant, use the general form:
ax²+bx+c=0
D=b²-4ac
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That its roots (solutions) are coincident.
yes that is true
true
It is finding the values of the variable that make the quadratic equation true.
In math speak: Solving the equation means finding 'x' values that make the equation true. These 'x' values are called the roots of the quadratic.