bjr
je factorise
B = (2x)² + 7² - 28x = (2x - 7)²
C = (5b)² - 8² = (5b + 8 ) (5b - 8)
D = 9² - (3x+5)² = (-9 +3x+5) (-9 - (3x+5)) = (3x-4) (-3x - 14)
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bjr
je factorise
B = (2x)² + 7² - 28x = (2x - 7)²
C = (5b)² - 8² = (5b + 8 ) (5b - 8)
D = 9² - (3x+5)² = (-9 +3x+5) (-9 - (3x+5)) = (3x-4) (-3x - 14)