Question

Calcule
ajudaaaa
a) 7a.(2a-5)=
b) (3a (ao quadrado)-2a-1).5a=

Answer 1

Resposta:

a) 14a² - 35a

a(14a -35)

a = 0

a' = 35/14

b) 5a.(3a² -2a -1)

15a³ - 10a² -5a ÷5

3a³ -2a² -a

a(3a² -2a -1) = 0

a = 0

3a² -2a -1 = 0

a' = 1

a'' = -0,33...

S = {0, 1, -0,33...}