Question

[Pham Trong Bach]

Tìm x, biết:

a) x 2 (x - 5) + 5 - x = 0;             b) 3 x 4  - 9 x 3  = -9 x 2  + 27x;

c)  x 2 (x + 8) +  x 2  = -8x;             d) (x + 3)( x 2  -3x + 5) =  x 2  + 3x.

Answer 1

[Cao Minh Tâm]