Factories: 20a2 – 45b2 – InterviewSolution

1.	Factories: 20a2 – 45b2
Answer» We have, 20a² – 45b² = 5(4a² – 9b²) By using the formula a² – b² = (a + b)(a – b) We get, 20a² – 45b² = 5(4a² – 9b²) = 5{(2a)² – (3b)²} = 5(2a + 3b)(2a – 3b)

Factories: 20a2 – 45b2

Answer»

We have,

20a² – 45b²

= 5(4a² – 9b²)

By using the formula a² – b² = (a + b)(a – b)

We get,

20a² – 45b² = 5(4a² – 9b²)

= 5{(2a)² – (3b)²}

= 5(2a + 3b)(2a – 3b)