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a²-b²=(a+b)(a-b)
(2x² - 5)² = (2x²)² - 2·2x²·5 + 5² = 4x⁴ - 20x² + 25
(2x² - 5)² = [ (x√2)² - (√5)² ]² = [ (x√2 + √5)(x√2 - √5) ]² =
= (x√2 + √5)²(x√2 - √5)²
albo