To simplify the expression \((a^2 - 11) + (3a^2 - 4a + 6)\), we can combine like terms.
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Write the expression clearly: \[ a^2 - 11 + 3a^2 - 4a + 6 \]
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Combine the \(a^2\) terms: \[ a^2 + 3a^2 = 4a^2 \]
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Combine the constant terms: \[ -11 + 6 = -5 \]
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The expression now looks like this: \[ 4a^2 - 4a - 5 \]
Thus, the simplified expression is: \[ \boxed{4a^2 - 4a - 5} \]