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daca |x+3|+|y-3|=0 atunci x•y=?

Răspuns :

[tex]|x+3| + |y-3| = 0\Rightarrow \Big\{x+3 = 0 \quad $si$ \quad y-3 = 0 \Big\} \\ \tex{ } $ $ $ $ \geq0 \quad \quad$ $ $ $ \geq 0 \\ \\ \Rightarrow \Big\{x = -3 \quad $si$ \quad y = 3\big\} \Rightarrow x\cdot y = -3\cdot 3 \Rightarrow \boxed{x\cdot y = -9}[/tex]