Question

answer the above question

it's factorisation
class8​

Answer 1

4x2 + y^2 - 4xy - 25

= 4x^2 - 4xy + y2 - 25

= 4x(x - y) + y^2 - 25

= 4x(x - y) + y^2 - 5^2

= 4x(x - y) + (y + 5)(y - 5)

Answer 2

Answer:

4x(x - y) + (y - 5)(y + 5)

Step-by-step explanation:

Given : 4x² + y² - 4xy - 25

→ 4x² - 4xy + y² - 25

→ 4x(x - y) + y² - 25

We can write this as :

→ 4x(x - y) + (y)² - (5)²

Identity : a² - b² = (a - b)(a + b)

Here, a = y, b = 5

→ 4x(x - y) + (y - 5)(y + 5)