CAIE IGCSE Additional Math 2 Quadratic Functions Topic Practice

$(3 k-2)^{2}-4(2)(k)\left[{ }^{*} 0\right]$
Uses $b^{2}-4 a c$
* could be any inequality sign or =$9 k^{2}-20 k+4\left[{ }^{*} 0\right]$
Correctly simplifies to 3-term quadratic
(9 k-2)(k-2)
FT Factorises or solves their 3-term
quadratic
Critical values $\frac{2}{9}, 2$$k<\frac{2}{9} k>2$$k<\frac{2}{9}$k>2
Mark final answer

$-2 \leqslant x \leqslant \frac{5}{4}$ mark final answer
B1 for the correct critical values

Uses $b^2-4ac$: $6^2-4(2k-1)(k+1)$. M1
$-8k^2-4k+40\ *\ 0$, where * is = or any inequality sign, or equivalent. M1
Factorises or solves their 3-term quadratic expression or equation for critical values, for example (5+2k)(8-4k). M1
Correct critical values: -2.5, 2. A1
$-2.5\leqslant k\leqslant 2$. A1