Quadratics (Edexcel A-Level Mathematics): Quizzes

$\Delta = b^2 - 4ac$

Two distinct real roots

One real root (repeated)

Complex (conjugate pairs)

$4k^2 - 12k$

$k < 0$ or $k > 3$

$a > 0$

$x = -\frac{b}{2a}$

$c$

$4$

$(2, -1)$

One (vertex touches x-axis)