Ταυτότητες

(a² - b)² =

• a³ -2ab + b²

• a⁴ + 2ab + b²

• a² - 2ab + b²

• a⁴ - 2ab + b²

Answer explanation

(a² - b)² = (a²)² - 2ab + b² = a⁴ - 2ab + b²

(a + b)³ = a³ + 3a²b + ... + b³

• 3ab

• 3ab²

• 2ab²

• 3a²b

Answer explanation

It is what it is 🙂

Η ταυτότητα a² - b² = (a + b)(a - b) λέγεται

(2x - y³)(2x + y³) =

• 4x - y⁶

• 4x² - y⁶

• 4x² - y²

• 4x² - y⁵

Answer explanation

(2x - y³)(2x + y³) = (2x)² - (y³)² = 4x² - y⁶

• x² + 2x + 4