Question

X elevado a 2 mais 2x menos 8= 0 (2,4)

Answer 1

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x² + 2x - 8 = 0

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∆ = b² - 4ac

∆ = 2² - 4(1)(-8)

∆ = 4 + 32

∆ = 36

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x = -b ± √∆ / 2a

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Aplicando no exercício:

-2 ± √36 / 2(1)

-2 ± 6 / 2

-1 ± 3

x' = 2

x" = -4

S = { 2 ; - 4 }

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Att:MarcosPCV

Answer 2

X2 + 2x- 8=0

X+2x-8=0

X+2x= 0+8

3x=8

X=3/8