Question

3- Escreva as equações que são do 2 grau com uma incognita:
b) 10x -3x+1=0
d) - 3x + 2 = 0
e) 4x - x = 0
1) 9x - 1 = 0
9) 2x + 5 = 0
h) Ox-5x + 6 = 0


me ajuda .....​

Answer 1

Resposta:

b) 10x -3x+1=0

7x + 1 = 0

7x = -1

x = -1/7

10x - 3x + 1 =0

10 × ( -1/7 ) - 3 × ( -1/7) + 1 = 0

-10/7 - 3/7 + 1 =0

- 7/7 + 1 = 0

- 1 + 1 = 0

0 = 0

d) - 3x + 2 = 0

-3x = -2

- x = -2/3

x = 2/3

- 3x + 2 = 0

- 3 × 2/3 + 2 = 0

- 6/3 + 2 = 0

- 2 + 2 = 0

0 = 0

e) 4x - x = 0

3x = 0

x = 0/3

x = 0

4x - x = 0

4 × 0 - 0 = 0

0 - 0 = 0

0 = 0

1) 9x - 1 = 0

9x = 1

x = 1/9

9x - 1 = 0

9 × 1/9 - 1 = 0

9/9 - 1 = 0

1 - 1 = 0

0 = 0

9) 2x + 5 = 0

2x = - 5

x = - 5/2

x = - 2,5

2x + 5 = 0

2 × ( - 2,5 ) + 5 = 0

- 5 + 5 = 0

0 = 0

h) Ox-5x + 6 = 0

-5x + 6 = 0

- 5x = -6

- x = - 6/5

- x = - 1,2

x = 1,2

0x - 5x + 6 = 0

0 × 1,2 - 5 × 1,2 + 6 = 0

0 - 6 + 6 = 0

- 6 + 6 = 0

0 = 0