bonsoir
a = √28
a = √7*2² = 2√7
b = - 3 √5 x 2 √5 = - 6 √25 = - 30
c = - 3 √5 + 4 √5 = √5
a = - 15 x² - 6 x - 30 x - 12
= - 15 x² - 36 x - 12
b = 3 x² - 12 x ³
c = 4 x + 9 - 6 x + 1 = - 2 x + 10
d = 5 ( x + y - k)
e = x ( 8 x - 3)
f = ( x + 4) ( 7 x - 1 + 3 - 2 x)
= ( x + 4) ( 5 x + 2)
