Bonjour,
a² -b² = (a-b) (a+b)
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab +b²
1) x² - 16 = (x-4) (x+4)
2) x² + 8x +16 = (a+4)²
3) 4x² - 12x + 9 = (a-3)²
4) 4x² - 25 = ( (2x-5) (2x+5)
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Bonjour,
a² -b² = (a-b) (a+b)
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab +b²
1) x² - 16 = (x-4) (x+4)
2) x² + 8x +16 = (a+4)²
3) 4x² - 12x + 9 = (a-3)²
4) 4x² - 25 = ( (2x-5) (2x+5)