Respuesta:
[tex]\boxed{(-2) \Delta (-1)=4}[/tex]
Paso a paso:
Remplazo.
[tex]a \Delta b=ab-a\\\\(-2) \Delta (-1)=(-2)(-1)-(-2)\\\\(-2) \Delta (-1)=2+2\\\\\boxed{(-2) \Delta (-1)=4}[/tex]
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Respuesta:
[tex]\boxed{(-2) \Delta (-1)=4}[/tex]
Paso a paso:
Remplazo.
[tex]a \Delta b=ab-a\\\\(-2) \Delta (-1)=(-2)(-1)-(-2)\\\\(-2) \Delta (-1)=2+2\\\\\boxed{(-2) \Delta (-1)=4}[/tex]