(2x-√5)²=
( a - b )² = a² - 2 * a * b + b²
(2x-√5)²= (2x)² - 2 * (2x) * √5 + (√5)² = 4x² - 4√5x + 5
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( a - b )² = a² - 2 * a * b + b²
(2x-√5)²= (2x)² - 2 * (2x) * √5 + (√5)² = 4x² - 4√5x + 5