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a fost răspuns

Descompuneti in produs de factori primi:@)2x la a doua -3x -2 b)4x la a doua -12x -7.

Răspuns :

Renatemambouko
2x²-3x-2=2x²-4x+x-2=2x(x-2)+(x-2)=(x-2)(2x+1)

4x²-12x-7=4x²-14x+2x-7=2x(2x-7)+(2x-7)=(2x-7)(2x+1)
Ionelzxc
Daca aX²+bX+c=0 are doua radacini reale x₁≠x₂ atunci aX²+bX+c=a(X-x₁)(X-x₂)
Daca 2X²-3X-2=0 ⇒....... x₁=2 si x₂=-1/2⇒2X²-3X-2=2(X-2)(X+1/2) si
Daca4X²-12X-7=0⇒........x₁=7/2 si x₂=-1/2⇒4X²-12X-7=4(X-7/2)(X+1/2)

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