Ex.
[tex]2 {x}^{4} + 8 {x}^{3} + 4 {x}^{2} + 2 {x}^{2} [/tex]
This would be
[tex]2 {x}^{2} ( {x }^{2} + 4x)(2 + 1)[/tex]
How?
Group them
[tex](2 {x}^{4 } + 8 {x}^{3} )(4 {x}^{2} + 2 {x}^{2} )[/tex]
Make sure there is a GCF.
[tex]2 {x}^{2} ( { x}^{2} + 4x)(2 + 1)[/tex]
Hope this was clear