Question

resolva as equações do 2° grau ?

Answer 1

A) 4x^2-36=0

4x^2=36

x^2=36/4

x^2=9

x=√9 = 3

B)7x^2-21=0

7x^2=21

x^2=21/7

x=√3

C)x^2+9=0

x^2=-9

x=√-9 =3i

D)x^2-49=0

x^2=49

x=√49 = 7

E)5x^2-20=0

5x^2=20

x^2= 20/5

x=√4 = 2