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If a quadratic equation has D=-12, which statement is correct regarding its graph?

Answer and explanation

Correct answer: The parabola does not cut the x-axis

The discriminant D=b²−4ac links the algebraic roots of a quadratic equation with the graph of its parabola y=ax²+bx+c. Here D=-12, which is negative. A negative discriminant means that the quadratic equation has no real roots, because √D is not real. On the graph, a real root is exactly an x-coordinate where the parabola meets the x-axis. Since there are no real roots, the parabola has no point of intersection with the x-axis. Therefore option A is correct. D=0 would mean that the parabola touches the x-axis once, while D>0 would mean that it cuts the axis at two distinct points. Passing through the origin requires c=0 and is not implied by D=-12.

Related tags

Quadratic-EquationsDiscriminantParabolaNature Of RootsQuadratic EquationsMathematicsClass 10 Mcq

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