Question

Respondam as q vcs souberem, preciso dos cálculos​

Answer 1

Explicação passo-a-passo:

a)

x² - 15x = 0

x . (x - 15) = 0

x = 0

x - 15 = 0

x = 15

b)

x² - 81 = 0

x² = + 81

x' = 9

x" = -9

c)

x² - 121 = 0

x² = + 121

x' = 11

x" = -11

d)

3x² - 5x = 0

x . (3x - 5) = 0

x = 0

3x - 5 = 0

x = 5/3

e)

x² - 1x = 0

x . (x - 1) = 0

x = 0

x - 1 = 0

x = 1

f)

9x² - 16 = 0

x² = 16/9

x' = 4/3

x" = -4/3

g)

x² + 25 = 0

x² = - 25

x' = 5i

x" = -5i

h)

11x² - 1x = 0

x . (11x - 1) = 0

x = 0

11x - 1 = 0

x = 1/11

i)

49x² - 36 = 0

x² = 36/49

x' = 6/7

x" = - 6/7

j)

3x² - 27x = 0

x . (3x - 27) = 0

x = 0

3x - 27 = 0

x = 9

k)

x² - 14 = 0

x² = + 14

x' = V14

x" = -V14

l)

-25x² + 15x = 0

x . (-25x + 15) = 0

x = 0

-25x + 15 = 0

x = 3/5