Resposta :
2x² + 2x - 24 = 0
a = 2
b = 2
c = - 24
∆ = 2² - 4 . 2 . (-24)
∆ = 4 + 192
∆ = 196
x = - b ± √∆
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2a
x' = - 2 - 14
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2 . 2
x' = - 16
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4
x' = - 4
x" = - 2 + 14
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2 . 2
x" = 12
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4
x" = 3
- 4 . 3 = - 12
Letra C