Question

Resolva as equações do 2° grau incompletas

a-) 4x² - 32x = 0

b-) 2x² - 12x = 0

c-) x² + 9 = 0

d-) 5x² -15x = 0

Answer 1

a) S = {0,8}

b) S = {0,6}

c) S = (-3i,+3i}

d) S = {0,3}

a-) 4x² - 32x = 0

4x(x-8) = 0

4x = 0

x = 0/4

x¹ = 0

x-8 = 0

x² = 8

S = {0,8}

b-) 2x² - 12x = 0

2x(x-6) = 0

2x = 0

x = 0/2

x¹ = 0

x-6 = 0

x² = 6

S = {0,6}

c-) x² + 9 = 0

x² = -9

x = +-√-9

x¹ = -3i

x² = +3i

S = (-3i,+3i}

d-) 5x² -15x = 0

5x(x-3) = 0

5x = 0

x = 0/5

x¹ = 0

x-3 = 0

x² = 3

S = {0,3}

❤️ Feito com carinho ❤️

19/07/22