Explicación paso a paso:
a^2-12a-45
a^2+3a-15a-45
a(a+3)-15(a+3)
(a-15)(a-3)
a=15
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Explicación paso a paso:
a^2-12a-45
a^2+3a-15a-45
a(a+3)-15(a+3)
(a-15)(a-3)
a=15