Question

2ori(x+1)^2-3ori(x-2)ori(x+2)+5xori(x-3)-(3x-1)^2 calculat este:
A)-5^2-5x+5
B)x^2-17x-2
C)-5x^2-11x-1
D)-5x^2-5x+13

^ = la puterea
Vreau rezultate complete, in fractii nu vorbe

Answer 1

2ori(x+1)^2-3ori(x-2)ori(x+2)+5xori(x-3)-(3x-1)^2

2(x+1)² - 3(x-2)(x+2) + 5x(x-3) - (3x-1)² = 2(x²+2x+1) -3(x²-4)+5x²-15x-

-(9x² - 6x + 1) = 2x² + 4x + 2 - 3x² + 12 + 5x² - 15x - 9x² + 6x - 1=

= - 5x² - 5x +13

Answer 2

2·( x+ 1)²- 3·( x- 2)( x+ 2) + 5x( x-3) - ( 3x- 1)² =

2·( x+ 1)( x+ 1) - 3·( x- 2)( x+ 2) + 5x( x-3) - ( 3x- 1)( 3x- 1) =

2( x² + x+ x+ 1) - 3( x²+ x- x- 4) + 5x²- 15x- ( 9x²- 3x- 3x+ 1) =

2( x² + 2x+ 1) - 3( x²- 4) + 5x²- 15x- ( 9x²- 6x+ 1) =

2 x² + 4x+ 2 - 3 x² + 12+ 5x²- 15x- 9x²+ 6x- 1=
          ---   ...               ....            ----        ---   ....
- 5x²- 5x+ 13