Bonjour
3y+8=7y-3
3y - 7y = - 3 - 8
y = - 11
(7y+6)(3y-10)=0
7y + 6 = 0 ou 3y - 10 = 0
7y = - 6 3y = 10
y = - 6/7 y = 10/3
A au carré=9.75
a² - 9,75 = 0
(a - 3,1225) (a + 3,1225) = 0
a - 3,1225 = 0 ou a + 3,1225 = 0
a = 3,1225 a = - 3,1225
A au carré-13=0
a² - 13 = 0
(a - 3,60555127546
) (a + 3,60555127546
) = 0
a - 3,60555127546 = 0 ou a + 3,60555127546 = 0
a = 3,60555127546 a = - 3,60555127546
