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5x-4x(x+2)= [tex] 3-(2x+1)^{2} [/tex]

Răspuns :

5x - 4x ( x + 2 ) = 3 - ( 2x + 1 )² =
5x - 4x
² - 8x = 3 - ( 4x² + 4x + 1 ) =
5x - 4x
² - 8x = 3 - 4x²  - 4x - 1 =
5x - 8x = 3 - 4x - 1
- 3x = 2 - 4x
- 3x + 4x = 2 
⇒ x = 2