The expression gives

MATHEMATICS · Single correct · AoPS · Mathematics · Quadratic Equations - Part 2 · Quadratic Equations - Part 2

Problem

The expression −b±b2−4ac2a\dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a} gives (a) the axis of symmetry of the parabola y=ax2+bx+cy = ax^2 + bx + c (b) the discriminant of the quadratic expression ax2+bx+cax^2 + bx + c (c) the roots of the equation ax2+bx+c=0ax^2 + bx + c = 0 (d) the maximum or minimum value of the quadratic expression ax2+bx+cax^2 + bx + c

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