Sagot :
Réponse :
bonjour
4 x² - 44 x + 121 = ( 2 x - 11 )²
4 x² - 44 x + 121 + ( 2 x - 11 ) ( 3 x + 8 )
= ( 2 x - 11 )² + ( 2 x - 11 ) ( 3 x + 8 )
= ( 2 x - 11 ) ( 2 x - 11 + 3 x + 8)
= ( 2 x - 11 ) ( 5 x - 3 )
25 x² + 60 x + 36 + ( 5 x + 6 ) ( 7 x - 1 )
= ( 5 x + 6 )² + ( 5 x + 6 ) ( 7 x - 1 )
= ( 5 x + 6 ) ( 5 x + 6 + 7 x - 1 )
= ( 5 x + 6 ) ( 12 x + 5 )
Explications étape par étape
Salut !
1) a) 4x² - 44x + 121 = (2x)² - 2(2x)(11) + 11² = (2x-11)²
b) 4x² - 44x + 121 + (2x - 11)(3x+8)
= (2x-11)² + (2x - 11)(3x+8)
= (2x-11)(2x-11) + (2x-1)(3x+8)
= (2x-11)[(2x-11)+(3x+8)]
= (2x-11)(5x-3)
2) a) 25x²+60x+36 = (5x)²+2(5x)(6)+6² = (5x+6)²
b) 25x²+60x+36 + (5x+6)(7x-1)
= (5x+6)² + (5x+6)(7x-1)
= (5x+6)(5x+6) + (5x+6)(7x-1)
= (5x+6)[(5x+6)+(7x-1)]
= (5x+6)(12x+5)