a)Ta thấy: \(-\left|x\right|\le0\)
\(\Rightarrow-\left|x\right|+2\le2\)
\(\Rightarrow A\le2\)
Dấu = khi \(-\left|x\right|=0\Leftrightarrow x=0\)
Vậy MaxA=2 khi x=0
b)Ta thấy:\(-\left|x\right|\le0\)
\(\Rightarrow-15-\left|x\right|\le-15\)
\(\Rightarrow B\le-15\)
Dấu = khi \(-\left|x\right|=0\Leftrightarrow x=0\)