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HELOeJABEZ
@HELOeJABEZ
October 2019
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Calcule as raizes da equaçao a)5ײ₋20=0 b)ₓ²+x÷5=0 c)7ˣ²₋21=0 d) ₋ˣ²+4ˣ=0 obs: a materia e equaçao de 2 grau com uma incognita (me ajudem por favor)
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MarvinNogueiraa
Facil amiga, irei te ajudar
a)5 x² - 20 = 0
5 x² = 20
x² = 20/5
x² = 4
x = +ou- √4
x = + ou - 2
S = +2 ; - 2}
b)x² + x/5 = 0
m.m.c = 5
5 x² / 5 + x/5 = 0/5 eliminar o denominador
5 x² + x = 0
x(5 x + 1) = 0
x = 0
5 x + 1 = 0
5 x = -1
x = -1/5
S = {0 ; -1/5 }
c)7 x² - 21 = 0
7 x² = 21
x² = 21/7
x² = 3
x = + ou - √3
S = +√3 ; - √3 }
d)-x² + 4 x = 0
x(- x + 4 ) = 0
x = 0
- x + 4 = 0
-x = -4
x = -4/-1
x = 4
S = [0 ; 4 }
Espero ter ajudado, fique com deus!
1 votes
Thanks 1
HELOeJABEZ
muito obrigada mesmo pela ajuda
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Lista de comentários
a)5 x² - 20 = 0
5 x² = 20
x² = 20/5
x² = 4
x = +ou- √4
x = + ou - 2
S = +2 ; - 2}
b)x² + x/5 = 0
m.m.c = 5
5 x² / 5 + x/5 = 0/5 eliminar o denominador
5 x² + x = 0
x(5 x + 1) = 0
x = 0
5 x + 1 = 0
5 x = -1
x = -1/5
S = {0 ; -1/5 }
c)7 x² - 21 = 0
7 x² = 21
x² = 21/7
x² = 3
x = + ou - √3
S = +√3 ; - √3 }
d)-x² + 4 x = 0
x(- x + 4 ) = 0
x = 0
- x + 4 = 0
-x = -4
x = -4/-1
x = 4
S = [0 ; 4 }
Espero ter ajudado, fique com deus!