Question

x=-b+√b2-4ac/2b quando a = 5, b = -9 e c= -2.
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Answer 1

Resposta:

X = – b ± √b² – 4.a.c

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2.a

X = – (–9) ± √(–9)² – 4.5.(–2)

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2.5

X = 9 ± √81 + 40

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10

X = 9 ± √121

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10

X = 9 ± 11

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10

X¹ = 9 + 11 X¹ = 20 X¹ = 2

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10 10

X² = 9 – 11 X² = – 2 : ² X² = – 1

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10 10 :² 5

Solução : { – 1/5 ; 2}