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(2x+1)^2 - (2x-1)^2 totul supra (x+1)^2 - (x-1)^2
VA ROG MULT (^2=puterea2)


Răspuns :

[(2x+1)²-(2x-1)²] /[(x+1)²-(x-1)²] =

=(2x+1-2x+1)(2x+1+2x-1] /(x+1-x+1)(x+1+x-1) =

=(2×4x) /(2×2x) =8x /4x =2