Respuesta:
=63a
Explicación paso a paso:
[tex]-9a*(-7)\\\\-9a*(-7)\\\\\mathrm{Multiplicar\:los\:numeros:}\:9\left(-7\right)=-63\\\\=-\left(-63\right)a\\\\\mathrm{Quitar\:los\:parentesis}:\quad \:-\left(-63\right)a=63a\\\\\\\\=64a[/tex]
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Verified answer
Respuesta:
=63a
Explicación paso a paso:
[tex]-9a*(-7)\\\\-9a*(-7)\\\\\mathrm{Multiplicar\:los\:numeros:}\:9\left(-7\right)=-63\\\\=-\left(-63\right)a\\\\\mathrm{Quitar\:los\:parentesis}:\quad \:-\left(-63\right)a=63a\\\\\\\\=64a[/tex]