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Alessandra160123
@Alessandra160123
September 2019
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Resolva a equação do segundo grau
X^ +4x -21=0
Mim ajudem pôr favor
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Paulloh1
Olá!!!
Resolução!!!
x² + 4x - 21 = 0
a = 1, b = 4, c = - 21
∆ = b² - 4ac
∆ = 4² - 4 • 1 • ( - 21 )
∆ = 16 + 84
∆ = 100
x = - b ± √∆ / 2a
x = - 4 ± √100 / 2 • 1
x = - 4 ± 10 / 2
x' = - 4 + 10 / 2 = 6/2 = 3
x" = - 4 - 10 / 2 = - 14/2 = - 7
S = { - 7, 3 }
Espero ter ajudado,,,
0 votes
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Resolução!!!
x² + 4x - 21 = 0
a = 1, b = 4, c = - 21
∆ = b² - 4ac
∆ = 4² - 4 • 1 • ( - 21 )
∆ = 16 + 84
∆ = 100
x = - b ± √∆ / 2a
x = - 4 ± √100 / 2 • 1
x = - 4 ± 10 / 2
x' = - 4 + 10 / 2 = 6/2 = 3
x" = - 4 - 10 / 2 = - 14/2 = - 7
S = { - 7, 3 }
Espero ter ajudado,,,