\(\left|x-3\right|\ge0\\ \Rightarrow-\left|x-3\right|\le0\\ \Rightarrow-2-\left|x-3\right|\le-2\\ \Rightarrow A=-2-\left|x-3\right|-5\le-7\)
Max A = -7 khi x=3
|x−3|≥0⇒−|x−3|≤0⇒−2−|x−3|≤−2⇒A=−2−|x−3|−5≤−7|x−3|≥0⇒−|x−3|≤0⇒−2−|x−3|≤−2⇒A=−2−|x−3|−5≤−7
Max A = -7 khi x=3