a)\(A=16-\left|x+2,5\right|\)
Vì \(\left|x+2,5\right|\ge0\Rightarrow A\le16-0=16\)
\(\Rightarrow MAX_A=16\Leftrightarrow x=-2,5\)
b)A=\(\left|x+2,5\right|-16\)
Vì \(\left|x+2,5\right|\ge0\Rightarrow A\ge0-16=-16\)
\(\Rightarrow MIN_A=-16\Leftrightarrow x=-2,5\)