Question

factorise the following 20x²-45​

Answer 1

hope this helps you mate

Answer 2

Answer:

Given : 20x

2

−45

By taking 5 as common

20x

2

−45=5(4x

2

−9)

We can write it as

20x

2

−45=5((2x)

2

−3

2

)

Based on the equation a

2

−b

2

=(a+b)(a−b)

We get,

20x

2

−45=5(2x+3)(2x−3)

hope it's help u..