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(3x+1)^2 + (x-1)^2+(2x+3) (2x-3) -2x (7x+2)

Răspuns :

(3x+1)² + (x-1)²+(2x+3)(2x-3) -2x(7x+2)=
9x
²+6x+1+x²-2x+1+4x²-9-14x²-4x=(-7)

(3x+1)²+(x-1)²+(2x+3)(2x-3)-2x(7x+2)=
9x²+6x+1+x²-2x+1+4x²-9-14x²-4x=
14x²-14x²+4x-4x+2-9=-7