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a fost răspuns

Ajutatima va rog frumos dau coroana!!! Descompuneti in factori

A)9-(x+2)^2

B)(2x-3y)+4y^2

C)(2x+5)^2-(3x-y)^2

D)3x^3+2x^2-3x-2

E)x^2-14x+45

F)x^2-15x-100

G)x^2+11x-26

Răspuns :

Renatemambouko
A)9-(x+2)²=(3-x-2)(3+x+2)=(1-x)(5+x)

B)(2x-3y)+4y²=2x-3y+4y²    (aici nu exista descompunere, ori e ceva gresit scris)

C)(2x+5)²-(3x-y)²=(2x+5-3x+y)(2x+5+3x-y)=(5-x+y)(5x+5-y)

 D)3x³+2x²-3x-2=x²(3x+2)-(3x+2)=(3x+2)(x²-1)=(3x+2)(x-1)(x+1)

 E)x²-14x+45=x²-9x-5x+45=x(x-9)-5(x-9)=(x-5)(x-9)

F) x²-15x-100=x²-20x+5x-100=x(x-20)+5(x+20)=(x-20)(x+5)

G)x²+11x-26=x²+13x-2x-26=x(x+13)-2(x+13)=(x+13)(x-2)











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