Answer:
14 - 7s² + 15
Explanation:
Given
(12 - 6s² + 4s) + (6 - 4s + 27) - (4 + s² + 12) ← distribute parenthesis
= 12 - 6s² + 4s + 6 - 4s + 27 - 4 - s² - 12 ← collect like terms
= 14 - 7s² + 15
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