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Va rog ex 4 . Mulțumesc anticipat

Va Rog Ex 4 Mulțumesc Anticipat class=

Răspuns :

a) (x+1)(x-1)=x^2-x+x-1=x^2-1( adev)
b)(x+1)(x+3)=x^2+3x+x+3=x^2+4x+3( adev)
c) (x+1)(-x+2)=-x^2+2x-x+2=-x^2+x+2(adev)