Question

Expand (4a-5b)².
V.

Answer 1

Answer:

(4a-5b)²

= (4a)² - 2(4a)(5b) + (5b)²

= 16a² - 40ab + 25b²

Answer 2

Answer:16a² + 25b² + 40ab

Step-by-step explanation:

By using (a+b) ^2 = a^2+ b^2 + 2ab,

(4a-5b)²= (4a)² + (5b)² + 2× 4a×5b

= 16a² + 25b² + 40ab