Question

Can some one help explain this

Answer 1

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Answer 2

`4( {x}^(2) - 1) - ( {x}^(2) - 8x - 5)`

`4 {x}^(2) - 4 - {x}^(2) + 8x + 5`

`3 {x}^(2) + 8x + 1`