Sagot :
Réponse :
a) y² - 22y + 121 = y² - 2 * y * 11 + 11² = (y - 11 )²
car (a - b)² = a² - 2ab + b²
b) 49 - 14x + x² = 7² - 2 * 7 * x + x² = (7-x)²
toujours car (a - b)² = a²- 2ab + b²
c) 100 - x² = 10² - x² = (10 + x)(10 - x)
car a² - b² = (a + b)(a - b)
d) y² + y + 0.25 = y² + 2 * y * 0.5² + 0.5² = (y + 0.5)²
car (a + b)² = a² + 2ab + b²
bonjour
y² - 22 y + 121 = ( y - 11 )²
49 - 14 x + x² = ( x - 7 )²
100 - y² = ( 10 - y ) ( 10 + y )
y² + y + 0.25 = ( y + 0.5 ) ²