Question

Please help me understand

Answer 1

`\huge \boxed {\sf \: {Answer}}`

`( {x}^(7) + 5x ^(4) - x + 2) - ( {5x}^(4) - {x}^(3) + 2) \\ ={x}^(7) + 5x ^(4) - x + 2 - {5x}^(4) + {x}^(3) - 2\\ = {x}^(7) + 5x ^(4) - {5x}^(4) + {x}^(3) - x + 2 - 2 \\ = {x}^(7) + {x}^(3) - x \\ = x( {x}^(6) + {x}^(2) - 1)`

Hope you could understand.

If you have any query, feel free to ask.