Question

h) (3x-1)^3 - 3(x+1)(x^2 - x + 1) + 2(x - 2)^3
g) (x^2 - 1)^3 - 3(x + 1)(x^2 + 1)(x + 1) + 4x^2(x^2 + 1)
f) (2x - 3y)^2 - (3x - y)(3x + y) + (x - 2y)^2 - (8x - 7y)(-2y)Proooszę?

Answer 1

h) (3x-1)^3 - 3(x+1)(x^2 - x + 1) + 2(x - 2)^3=

27x-1-3x+3*2x-x+1+(2x-4)^3=

=27x-1-3x+6x-x+1+*x-64=

=36x-64

reszte robi się tak samo

Answer 2

h) =27x^3-27x^2+9x-1-3(x^3-x^2+x-x+1)+2(x^3-6x^2+12x-8) =

  = 27x^3-27x^3+9-1-3x^3+3x^2-3x-3x^2+x-3+2x^3-12x^2+24x-16=

  = 26x^3-39x^2+31x-20

 

g) = x^6-3x^4+3x^2+1-3(x^3+x^2+x^2+1+x+1)+4x^4+4x^2 =

  = x^6-3x^4+3x^2+1-3x^3-3x^2-3x^2-3-3x-3+4x^4+4x^2 =

  = x^6+x^4-3x^3+x^2-3x-5

 

f) = 4x^2+12xy+9y^2-9x^2+y^2+x2+4y+4y^2+16xy-14y^2 = -4x^2+4y+28xy