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50 PUNCTE! Descompuneti in factori:
a) 9c la puterea 2 - 49d la puterea 2
b 9x - 54x la puterea 4


Răspuns :

a)
9c^2-49d^2=(3c-7d)(3c+7d)
b)
9x-54x^4=9x(1-6x^3)
A) 9c^2-49d^2 =
= (3c)^2 - (7d)^2 =
= (3c+7d) • (3c-7d)

B) 9x-54x^4 =
= 9x • ( 1 - 6x^3 )