Question

) Dada a expressão x2 - 2x - 3, determine:
a) Os coeficientes a, b ec;
b) O valor numérico para x = 2
c) Calcule o delta (A)​

Answer 1

Resposta:

ITEM A

x² – 2x – 3

a = 1 ; b = – 2 ; c = – 3

ITEM B

x² – 2x – 3

2² – 2 × 2 – 3

4 – 4 – 3

0 – 3

– 3

ITEM C

x² – 2x – 3

∆ = b² – 4ac

∆ = ( – 2 )² – 4 × 1 × ( – 3 )

∆ = 4 – ( – 12 )

∆ = 4 + 12

∆ = 16