Question

3) Resolva as equações incompletas. a)x² – 81 = 0 b) 2x² – 32 = 0 c) x² - 2 = 0 d) x² – 2x = 0 e) x² + 7x = 0 f) 2x² + 4x = 0​

Answer 1

Explicação passo-a-passo:

a)x² – 81 = 0

x² = + 81

x' = 9

x" = -9

b) 2x² – 32 = 0

x² = + 16

x' = 4

x" = -4

c) x² - 2 = 0

x² = + 2

x' = V2

x" = -V2

d) x² – 2x = 0

x . (x - 2) = 0

x = 0

x - 2 = 0

x = 2

e) x² + 7x = 0

x . (x + 7) = 0

x = 0

x + 7 = 0

x = -7

f) 2x² + 4x = 0

x . (2x + 4) = 0

x = 0

2x + 4 = 0

x = -2