Question

apply identity (4 m- n)(4 m+ n)​

Answer 1

Answer:

8m² - n²

Step-by-step explanation:

Given : (4m - n) (4m + n)

Identity : (a - b) (a + b) = a² - b²

Here, a = 4m, a = n

→ (4m)² - (n)²

On further solving, we get

→ 8m² - n²

Other identities which are frequently used :

• (a + b)² = a² + 2ab + b²
• (a - b)² = a² - 2ab + b²
• (x + a)(x + b) = x² + (a + b)x + ab
• (a + b)² - (a - b)² = 4ab

Answer 2

here (a-b)(a+b) = a^2 - b^2

here a = 4m, b= n

(4m-n) (4m+n)

(4m)^2 - (n)^2