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Je n'arrive pas à factoriser ces 5 égalités...

(x-1)(2x+1)+(6x+3)(3x)

(2x-1)^2-(x+3)(5-10x)

16-(3x+2)^2

(x+1)^2-(2x+3)^2

(x+6)^2-4(3x-1)^2

MercI d'avance


Répondre :

Bonjour,
(x-1)(2x+1)+(6x+3)(3x)
=(x-1)(2x+1)+3(2x+1)(3x)
=(x-1)(2x+1)+9x(2x+1)
=(2x+1)(x-1+9x)
=(2x+1)(10x-1)

(2x-1)^2-(x+3)(5-10x)
=(2x-1)(2x-1)-(x+3)5(1-2x)
=(2x-1)(2x-1)+5(x+3)(2x-1)
=(2x-1)(2x-1+5x+15)
=(2x-1)(7x+14)
=7(2x-1)(x+2)

16-(3x+2)^2
=(4-(3x+2))(4+(3x+2))
=(4-3x-2)(4+3x+2)
=(2-3x)(3x+6)
=3(2-3x)(x+2)

(x+1)^2-(2x+3)^2
=((x+1)+(2x+3))((x+1)-(2x+3))
=(x+1+2x+3)(x+1-2x-3)
=(3x+4)(-x-2)
=-(3x+4)(x+2)

(x+6)^2-4(3x-1)^2
=((x+6)+2(3x-1))((x+6)-2(3x-1))
=(x+6+6x-2)(x+6-6x+2)
=(7x+4)(8-5x)