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x²+14x +33=
(x-5)²-(x+4)²=


Răspuns :

X²+14x +33=X²+14x +49-16=(x+7)²-4² =(x+7+4)(x+7-4)=(x+11)(x+3)



(x-5)²-(x+4)²= (x²-10x+25)-(x²+8x+16)= x²-10x+25-x²-8x-16=9--18x=9(1-2x)


(x²-10x+25)-(x²+8x+16)= x²-10x+25-x²-8x-16=9--18x=9(1-2x)