Factorize each of the following expressions : `3-12(a-b)^2`

Explanation

`=3-12(a-b)^2`
`=3[1-4(a-b)^2]`
`=[(1)^2-{2(a-b)}^2]`
`=3{1+2(a-b)}{1-2(a-b)}`
`=3(1+2a-2b)(1-2a+2b)`