Question

função quadrática de x2+2x-8

Answer 1

Resposta:

x² + 2x - 8 = 0

∆ = b² - 4ac

∆ = 2² - 4 . 1 . (-8)

∆ = 4 + 32

∆ = 36

x = - b ± √∆

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2a

x' = -2 - 6

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2 . 1

x' = -8

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2

x' = - 4

x" = - 2 + 6

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2 . 1

x" = 4

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2

x" = 2

S = {-4 , 2}