(x - 8)(4x + 5) - (x - 8)(2x - 4)
= (x - 8)(4x + 5 - (2x - 4)) because they share x - 8
= (x - 8)(4x + 5 - 2x + 4) distributed the negative
= (x - 8)(2x + 9) added like terms
Answer: (x - 8)(2x + 9)
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