Question

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Answer 1

Resposta:

ITEM A

a = 2 ; b = 1 ; c = – 3

Δ = b² – 4ac

∆ = 1² – 4 × 2 × ( – 3 )

∆ = 1 – ( – 24 )

∆ = 1 + 24

∆ = 25

x = – b ± √∆ / 2a

x = – 1 ± √25 / 2 × 2

x = – 1 ± 5 / 4

x' = – 1 – 5 / 4

x' = – 6 / 4

x' = ( – 1,5 )

x" = – 1 + 5 / 4

x" = 4 / 4

x" = 1

2x² + x – 3 = 0

2 × ( – 1,5 )² + ( – 1,5 ) – 3 = 0

2 × 2,25 – 1,5 – 3 = 0

4,5 – 1,5 – 3 = 0

3 – 3 = 0

0 = 0

2x² + x – 3 = 0

2 × 1² + 1 – 3 = 0

2 × 1 + 1 – 3 = 0

2 + 1 – 3 = 0

3 – 3 = 0

0 = 0