Question

esolva as equaçoes do 2 grau
incompletas

A] x² - 36 = 0

B] x² - 36x = 0

C] 3x² - 75 = 0

D] 75x² - 3 = 0

E] 2x² - 800 =0

F] 800x² - 2x = 0

Answer 1

a)
x² - 36 = 0
x² = 36
x = √36
R.: x = + 6 e x = - 6
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b)
x² - 36x = 0
x(x - 36) = 0
x = 0

x - 36 = 0
x = 36

R.: x = 0 e x = 36
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c)
3x² - 75 = 0
3x² = 75
x² = 75/3
x² = 25
x = √25

R.: x = + 5 e x = - 5
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d)
75x² - 3 = 0
75x² = 3
x² =  3
       75

x =   √3  =     √3    =      1
       √75     √25.√3         5

R.: x = 1/5
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e)
2x² - 800 = 0
2x² = 800
x² = 800/2
x² = 400
x = √400

R.: x = + 20 e x = - 20
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f)
800x² - 2x = 0
x(800x - 2) = 0
x = 0

800x - 2 = 0
800x = 2 (:2)
400x = 1
x = 1/400

R.: x = 0 e x = 1/400