Question

The factorised form 4x2–81y2 is

Answer 1

Answer:

It is (4x^2 -81y^2)

Step-by-step explanation:

It is a^2 -b^2

=( (a+b) (a-b) )

= (4x+81y) , (4x-81y)

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Answer 2

Answer :

• 4x² - 81y² = (2x + 9y) (2x - 9y)

Given :

• 4x² - 81y²

Solution :

⤑ 4x² - 81y²

⤑ (2x)² - (9y)²

⤑ (2x + 9y) (2x - 9y)

using a² - b² = (a + b) (a - b)

Hence, 4x² - 81y² = (2x + 9y) (2x - 9y)

More Explanation

• a² - b² = (a + b) (a - b)
• (a + b) = a²+ 2ab + b²
• (a - b) = a²- 2ab + b²
• a³ - b³ = (a + b) (a² - ab + b²)
• a³ + b³ = (a - b) (a² + ab + b²)