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Descompuneti in factori
x²-y²-8x+16



Răspuns :

folosim formulele
(a-b)²=a²-2ab+b²
a²-b²=(a-b)(a+b)

x²-y²-8x+16=x²-8x+16-y²=(x-4)²-y²=(x-4-y)(x-4+y)