Question

Question 2 [7]

Use sign table to determine the values of 𝑥 for which

x^2 + 9𝑥 + 20 ≤ 0.

Answer 1

$x^2+9x+20≤0\implies (x+4)(x+5)≤0$

So, as we can see from the table, $x\in[-5;-4]$