Démontrer les égalités suivantes. a)22x² + 25x + 4 =(5x + 2)² - 3x² + 5x

b) (x + 5)(3x -2) + (x +5)(5x - 4 ) = (x + 5)(8x-6)

c) (5x + 8)² -4(2x + 5 )² = (3x - 6)(3x + 6)

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