Answered

Résoudre dans R b ) (2x+1)(x-1)

Sagot :

(2x+1)(x-1)
2x²-2x+x-1
2x²-x-1
= ( 2x + 1 ) ( x - 1 )
= 2x * x + 2x * (-1) + 1 * x + 1 * (-1)
= 2x^2 - 2x + 1x - 1
= 2x^2 - 1x - 1