Question

Can some one help explain this

Answer 1

Answer:

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

$4 {x}^{2} - 4 - {x}^{2} + 8x + 5$

$3 {x}^{2} + 8x + 1$

Answer 2

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