Question

Ajuda pfvvvv. Preciso urgente​

Answer 1

Resposta:

1) a)

S = {-20, 20}

b)

S = {-2, 2}

2) a)

S = {0, 7}

b)

S = {0, 3}

Explicação passo-a-passo:

1) a)

x² - 400 = 0

x² = 400

x = ± √400

x = ± 20

S = {-20, 20}

b)

2x² - 8 = 0

2x² = 8

x² = 8/2

x² = 4

x = ± √4

x = ± 2

S = {-2, 2}

2) a)

x² - 7x = 0

x (x - 7) = 0

x = 7

S = {0, 7}

b)

4x² - 12x = 0

x (4x - 12) = 0

4x = 12

x = 12/4

x = 3

S = {0, 3}