Réponse :
Explications étape par étape :
[tex](3x+6)^2=(3x)^2+2*3x*6+6^2=9x^2+36x+36[/tex]
[tex](4+5z)^2+(2+2z)(3+5z)=4^2+2*4*5z+(5z)^2+2*3+2*5z+2z*3+2z*5z\\=16+40z+25z^2+6+10z+6z+10z^2\\=35z^2+56z+22[/tex]
[tex]12x-2 = 2(6x-1)[/tex]
[tex](-2x+5)^2+(-2x+5)(-9x-2)=(-2x+5)((-2x+5)+(-9x-2))\\=(-2x+5)(-2x+5-9x-2)\\=(-2x+5)(-11x+3)[/tex]
[tex](5x+5)(4x-7)-(5x+5)(5x-7)=(5x+5)((4x-7)-(5x-7))\\= (5x+5)(4x-7-5x+7)\\=(5x+5)(-x)\\=5(x+1)(-x)\\=-5x(x+1)[/tex]
[tex](a-4)^2-(a-8)^2=((a-4)-(a-8))((a-4)+(a-8))\\=(a-4-a+8)(a-4+a-8)\\=4(2a-12)\\=4*2(a-6)\\=8(a-6)[/tex]
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Réponse :
Explications étape par étape :
[tex](3x+6)^2=(3x)^2+2*3x*6+6^2=9x^2+36x+36[/tex]
[tex](4+5z)^2+(2+2z)(3+5z)=4^2+2*4*5z+(5z)^2+2*3+2*5z+2z*3+2z*5z\\=16+40z+25z^2+6+10z+6z+10z^2\\=35z^2+56z+22[/tex]
[tex]12x-2 = 2(6x-1)[/tex]
[tex](-2x+5)^2+(-2x+5)(-9x-2)=(-2x+5)((-2x+5)+(-9x-2))\\=(-2x+5)(-2x+5-9x-2)\\=(-2x+5)(-11x+3)[/tex]
[tex](5x+5)(4x-7)-(5x+5)(5x-7)=(5x+5)((4x-7)-(5x-7))\\= (5x+5)(4x-7-5x+7)\\=(5x+5)(-x)\\=5(x+1)(-x)\\=-5x(x+1)[/tex]
[tex](a-4)^2-(a-8)^2=((a-4)-(a-8))((a-4)+(a-8))\\=(a-4-a+8)(a-4+a-8)\\=4(2a-12)\\=4*2(a-6)\\=8(a-6)[/tex]