If both roots of the equation $a{ x }^{ 2 }+2xa+1+{ a }^{ 2 }-16=0$ are opposite in sign, then the range of $a$ is
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If both roots of the equation $a{ x }^{ 2 }+2xa+1+{ a }^{ 2 }-16=0$ are opposite in sign, then the range of $a$ is