BONJOUR,urgent SVP !! Factorise puis réduis chaque expression

R = (x+4) au carré - 49
R= (x+4) au carré - 7 aucarré
S= (x-4)²-(2x-1)²

T= 4-(1-3x)²

U= (3-2x)²-4

V= 121 - (x-7)²

W= (7x+8)² - (9-5x)²
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