Nomehhidn
Answered

Sumali sa IDNStudy.com at makuha ang mabilis at kaugnay na mga sagot. Ang aming komunidad ay handang magbigay ng malalim at praktikal na mga solusyon sa lahat ng iyong mga katanungan.

pahelppppp pooo asapp​

Pahelppppp Pooo Asapp class=

Sagot :

Answer:

1. x = ±2√2

2. x1 = 0 , x2 = 4

3. x1 = 0 , x2 = 14

4. x1 = 0 , x2 = 3

5. x1 = 0 , x2 = 15/7

Step-by-step explanation:

I.

1. x² - 8 = 0

x² = 8

√x² = √8

x = ±√2² × 2

x = ±2√2

2. 5x² - 20x = 0

5x² ÷ 5 - 20x ÷ 5 = 0 ÷ 5

x² - 4x = 0

x² - 4x + 4 = 0 + 4

(x - 2)² = 4

√(x - 2)² = √4

x - 2 = ±2

x - 2 = 2

x = 2 + 2

x = 4

x - 2 = - 2

x = -2 + 2

x = 0

3. x² = 14x

x² - 14x = 0

x² - 14x + 49 = 0 + 49

(x - 7)² = 49

√(x - 7)² = √49

x - 7 = ±7

x - 7 = 7

x = 7 + 7

x = 14

x - 7 = -7

x = -7 + 7

x = 0

4. 9x² - 27x = 0

9x² ÷ 9 - 27x ÷ 9 = 0 ÷ 9

x² - 3x = 0

x² - 3x + 9/4 = 0 + 9/4

(x - 3/2)² = 9/4

√(x - 3/2)² = √9/4

x - 3/2 = ±3/2

x - 3/2 = 3/2

x = 3/2 + 3/2

x = 6/2 ÷ 2/2

x = 3

x - 3/2 = -3/2

x = -3/2 + 3/2

x = 0

5. 7x² = 15x

7x² - 15x = 0

7x² ÷ 7 - 15x ÷ 7 = 0 ÷ 7

x² - 15/7x = 0

x² - 15/7x + 225/196 = 0 + 225/196

(x - 15/14)² = 225/196

√(x - 15/14)² = √225/196

x - 15/14 = ± 15/14

x - 15/14 = 15/14

x = 15/14 + 15/14

x = 30/14 ÷ 2/2

x = 15/7

x - 15/14 = -15/14

x = -15/14 + 15/14

x = 0