(a2-2a) to the power 2 -23 (a2-2a)+120
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(a² - 2)² - 23(a² - 2) + 120
=(a²)² - 2×a²×2 + (2)² - 23×a² - 23×2 + 120
= a⁴ - 4a² + 4 - 23a² - 46 + 120
= a⁴ - 4a² - 23a² + 4 - 46 + 120
= a⁴ - 27a² + 78
=(a²)² - 2×a²×2 + (2)² - 23×a² - 23×2 + 120
= a⁴ - 4a² + 4 - 23a² - 46 + 120
= a⁴ - 4a² - 23a² + 4 - 46 + 120
= a⁴ - 27a² + 78
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