Solve the inequality \((x-4)(x+2)(x-1) \geqslant 0\). (2 marks)
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\((x-4)(x+2)(x-1) \geqslant 0\)
\(\text{Zeros at} \ \ x=4, x=-2 \ \ \text{and}\ \ x=1\)
\(\text{At} \ \ x=0: \ (-4)(2)(-1)>0\)
\(\therefore \text{Graph}\ \geqslant 0 \ \text {for} \ -2 \leqslant x \leqslant 1\ \cup\ x \geqslant 4\)