Sagot :
bonsoir
a ) - 4 ( x - 7 ) - 3 ( x + 9 )
= - 4 x + 28 - 3 x - 27
= - 7 x + 1
b ) 2 ( 5 x - 9 )
= 10 x - 18
c ) 5 x ( 2 x - 3 )
= 10 x² - 15 x
bonsoir
a ) - 4 ( x - 7 ) - 3 ( x + 9 )
= - 4 x + 28 - 3 x - 27
= - 7 x + 1
b ) 2 ( 5 x - 9 )
= 10 x - 18
c ) 5 x ( 2 x - 3 )
= 10 x² - 15 x