Question

(3x+1)² + 2(x+1) (x-1)-3(2x-5)² va roog

Answer 1

(3x+1)²=(3x)²+2*3x*1+1²
          =9x²+6x+1

2(x+1)(x-1)=(2x+2)(2x-2)=(2x)²-2²
                                   =4x²-4

3(2x-5)²=(6x-15)²=(6x)²+2*6x*15+15²
                        =36x²+180x+225


9x²+6x+1+4x²-4-36x²+180x+225=13x²+186x+(-3)
9x²+4x²+6x+180x+1-4=13x²+186x+(-3)

Sper ca te-am ajutat! Nu cred ca am gresit nimic! :)

Answer 2

(3x+1)² + 2(x+1) (x-1)-3(2x-5)²=6x²+6x-1+2(x²-1)-3(4x²-20x+25)=
6x²+6x-1+2x²-2-12x²+60x-75=
-4x²+66x-78