Sagot :
Réponse:
Exercice 1 )
A : 3(2x + 13) + 5(8 - 11x)
= (3 × 2x + 3 × 13) + (5 × 8 - 5 × 11x)
= 6x + 39 + 40 - 55x
= -49x + 79
B : ( 3 - x ) (-7x + 1)
= ( 3 × (-7x) + 3 × 1 ) - ( x × (-7x) + x × 1 )
= -21x + 3 - (-7x²) + x
= 7x² - 20x + 3
Réponse:
Exercice 1 )
A : 3(2x + 13) + 5(8 - 11x)
= (3 × 2x + 3 × 13) + (5 × 8 - 5 × 11x)
= 6x + 39 + 40 - 55x
= -49x + 79
B : ( 3 - x ) (-7x + 1)
= ( 3 × (-7x) + 3 × 1 ) - ( x × (-7x) + x × 1 )
= -21x + 3 - (-7x²) + x
= 7x² - 20x + 3