U5 = S5 - S4
= (12(5) - 5²) - (12(4) - 4²)
= 12(5) - 12(4) + (4² - 5²)
= 12(5 - 4) + (4 + 5)(4 - 5)
= 12(1) + 9(-1)
= 12 - 9
= 3
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Verified answer
U5 = S5 - S4
= (12(5) - 5²) - (12(4) - 4²)
= 12(5) - 12(4) + (4² - 5²)
= 12(5 - 4) + (4 + 5)(4 - 5)
= 12(1) + 9(-1)
= 12 - 9
= 3