Question

(2a-b) (2a+b)=...............

Answer 1

Answer:

Step-by-step explanation:

Given that (a² - ab + 2b²)/(a² + ab + 4b²) =1/3

On cross multiplying we get

 3a² - 3ab + 6b² = a² + ab + 4b²

⇒ 2a² - 4ab + 2b² = 0

on taking common factor 2 out we get

   a² - 2ab + b² = 0

⇒ (a - b)² = 0

⇒ a - b = 0

⇒ a = b.

now substituting a = b in

(2a + 2b )/(2a - b)

⇒(2a + 2a)/(2a -a)

= 4a/a

= 4

Answer 2

4a square-b square

Step-by-step explanation:

(2a square-b) (2a square+b)

(2a) square -(b) square

4a square -b square