Sagot :
bonjour
A=16 x² -1 = ( 4 x - 1 ) ( 4 x + 1 )
B=100-25 x² = ( 10 - 5 x ) ( 10 + 5 x )
C=-9x²+4x = - x ( 9 x - 4 )
D=12 x²+27 = 3 ( 4 x² + 9 )
E=(4 x+1)²–9 = ( 4 x + 1 - 3 ) ( 4 x + 1 + 3 ) =
( 4 x - 2 ) ( 4 x + 4 ) = 4 ( 4 x - 2 ) ( x+ 1 )
F=(2x+2)²-(x+1)² = ( 2 x + 2 + x + 1 ) ( 2 x+ 2 - x - 1 ) = ( 3 x + 3 ) ( x + 1 )
= 3 ( x + 1 ) ( x + 1 )
Réponse :
A = a²-b² =(a-b)(a+b)
A = (4x-1)(4x+1)
B = a²-b²=(a-b)(a+b)
B = (10-5x)(10+5x)
C = x(-9x+4)
C =-x(9x-4)
D = 3(4x²+9)
E = comme A et B
a²= (4x+1)², a=(4x+1)
b² =9, b= 3
(4x+1-3)(4x+1+3)
E = (4x-2)(4x+4)
E = 2(2x-1)(4x+4)
E = 8(2x-1)(x+1)
F = a²-b² =(a-b)(a+b)
F = (2x+2-x-1)(2x+2+x+1)
F =(x+1)(3x+3)
F = 3(x+1)(x+1)
F = 3(x+1)²
Explications étape par étape :