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= 12 - 36x + 27x² - ( 4 - 9x²)=
=12 - 36x + 27 x² - 4 + 9x²=
= 36x² - 36x + 8
podstawiam = 36 ×( 2√2)² - 36×2√2 +8= 36 × 8 - 72√2 +8 = 296 - 72√2