Question

Efectuati
Va rog dau 3 coroane

b)(2x-3)(4x^2+6x+9)
c)(3x+5)(9x^2 - 15x+25 )
d) (2x-3)(3x-2)+(1-3x)(2x-1)+(x-2)(2x^2 - 3x+3 )

Answer 1

b) (2x-3)(4x^2+6x+9) = (2x-3)(2x-3)^2 = (2x-3)^3.

c) (3x+5)(9x^2-15x+25) = (3x-5)(3x-5)^2 = (3x-5)^3.

d) (2x-3)(3x-2)+(1-3x)(2x-1)+(x-2)(2x^2-3x+3) =
2x(3x-2)-3(3x-3)+2x-1-3x(2x-1)+x(2x^2-3x+3)-2(2x^2-3x+3) =
6x^2-4x-9x+9+2x-1-6x^2+3x+2x^3-3x^2+3x-4x^2+6x-6 =

6x^2 cu -6x^2 se reduc; -9x cu 3x și cu 6x se reduc.

-4x+9+2x-1+2x^3-3x^2+3x-4x^2-6 =
x+2x^3+1-7x^2 =
2x^3-7x^2+x+1.





I hope I helped you :)