Question

What is 4xx - 9 = 16

Answer 1

`\{-(5)/(2)\ ,\ (5)/(2) \}`

Explanation:

SOLVING THE EQUATION :

4x² - 9 = 16

⇔ 4x² = 16 + 9

⇔ 4x² = 25

⇔ 2² × x² = 25

⇔ (2x)² = 25

⇔ (2x)² = 5²

⇔ 2x = 5 or 2x = -5

⇔ x = 5/2 or x = -5/2