Răspuns :
Raspuns:
Explicație pas cu pas:
9(x+3)^2-4x^2=(3x+9-2x)(3x+9+2x)=(x+9)(5x+9)
9x^2-(3x-2)^2=2(3x+3x-2)=2(6x-2)=2×2(3x-1)=4(3x-1)
Raspuns:
Explicație pas cu pas:
9(x+3)^2-4x^2=(3x+9-2x)(3x+9+2x)=(x+9)(5x+9)
9x^2-(3x-2)^2=2(3x+3x-2)=2(6x-2)=2×2(3x-1)=4(3x-1)