16x² - 25 = 0
16x² = 25
x² = 25/16
x₁ = 5/4 ; x₂ = -5/4
1) 36a⁴ - 25 = (6a²)² - 5² = (6a² - 5)(6a² + 5)
2) 64 - 9a²b² = 8² - (3ab)² = (8 - 3ab)(8 + 3ab)
16x² - 25 = 0
16x² = 25
x² = 25/16
x₁ = 5/4 ; x₂ = -5/4
1) 36a⁴ - 25 = (6a²)² - 5² = (6a² - 5)(6a² + 5)
2) 64 - 9a²b² = 8² - (3ab)² = (8 - 3ab)(8 + 3ab)