September 2018 1 32 Report
Como resuelvo:

A) (3x-1)² - (3x+1)²

B) 2(x-5)² - (2x²+3x+50)

C) (5x-4)(2x+3)-5

D) 3(x²+5) - (x²+40)

E) (x+3)²- {x²+(x-3)²}
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