To simplify the expression \((a^2−11)+(3a^2−4a+6)\), you can first distribute and then combine like terms.
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Start with the original expression: \[ (a^2 - 11) + (3a^2 - 4a + 6) \]
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Remove the parentheses: \[ a^2 - 11 + 3a^2 - 4a + 6 \]
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Combine like terms:
- Combine the \(a^2\) terms: \(a^2 + 3a^2 = 4a^2\)
- Combine the \(a\) terms: \(-4a\)
- Combine the constants: \(-11 + 6 = -5\)
Putting it all together, we get: \[ 4a^2 - 4a - 5 \]
So, the simplified expression is: \[ \boxed{4a^2 - 4a - 5} \]