Question

b) X^2 - 5X = 0
c) 4X^2 - 9X = 0
d) 3X^2 + 5X = 0
e) 4X^2 - 12X = 0
f) 5X^2 + X = 0
g)X^2 + X = 0​

Answer 1

Explicação passo-a-passo:

b) x ( x -5)=0

x1=0

x -5=0

x2= 5

S = { 0, 5}

c) x ( 4x -9)=0

x1=0

4x - 9=0

x = 9/4

S = { 0, 9/4}

d) x (3x +5)=0

x1=0

3x +5=0

x2 = -5/3

S = { 0 , -5/3}

e) 4x ( x - 3)=0

4x=0

x=0/4

x1=0

x -3 =0

x2=+3

S = { 0 , 3}

f) x (5x + 1)=0

x1= 0

5x +1=0

5x = -1

x2= -1/5

S = { 0 , - 1/5}

g) x ( x +1)=0

x1= 0

x +1=0

x = -1

S = { 0 , - 1}

Answer 2

Resposta:

b) x² - 5x = 0

   x(x - 5) = 0

   x = 0

   x - 5 = 0    x = 5

c) 4x² - 9x = 0

   x(4x - 9) = 0

   x = 0

   4x - 9 = 0    4x = 9     x = 9/4

d) 3x² + 5x = 0

   x(3x + 5) = 0

   x = 0

   3x + 5 = 0    3x = - 5  x = -5/3

e) 4x² - 12x = 0

    4x(2x - 3) = 0

    4x = 0    x = 0/4    x = 0

    2x - 3 = 0    2x = 3   x = 3/2

f) 5x² + x = 0

  x(5x - 1) = 0

   x = 0

   5x - 1 = 0    5x = 1       x = 1/5

g) x² + x = 0​

   x(x - 1) = 0

   x = 0

   x - 1 = 0    x = 1

Explicação passo a passo:

Espero ter ajudado!!!