Question

Resolva as equações do 2°grau:
A)3ײ-10=0
B)7ײ+2=30
C)4ײ=36
D)×(×+3)=5×​

Answer 1

A) 4x2-36=0

4x2=36

x2=36/4

x2=9

x=+/- √9

x=+/-3

B) 7x2=21=0

7x2=21

x2=21/7

x2=3

x=+/- √3

x≡+/-1,7320

C) x2+9=0

x2=-9

x2=√-9

pois nao existe raiz quadrada de um numero negativo.

D) x2-49=0

x2=49

x=+/-7

E) 5×2-20=0

5×2=20

x2=20/5

x2=4

x=+/-√4 x=+/-2

BEIJO ATE NA PROXIMA BEY BEY :)