Question

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Pergunta 4: Se M = (x – 1)(x + 2) e N = (x + 1)(x + 3), determine o valor de M + N. *

A) 2x² + 5x + 1

B) x² – 5x – 1

C) x² + 5x - 1

D) 2x² – 5x - 1

E) x² + 5x + 1

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Answer 1

Resposta:

Alternativa A

Explicação passo-a-passo:

M = (x - 1)(x + 2)

M = (x * x) + (x * 2) - (1 * x) - (1 * 2)

M = x² + 2x - x - 2

M = x² + x - 2

N = (x + 1)(x + 3)

N = (x * x) + (x * 3) + (1 * x) + (1 * 3)

N = x² + 3x + x + 3

N = x² + 4x + 3

M + N = x² + x - 2 + x² + 4x + 3

M + N = 2x² + 5x + 1

Alternativa A.