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U10 = S10 - S9
= 2(10)^2 -3(10) + 5 - ( 2(9)^2 - 3(9) + 5 )
= 2(100) - 30 - ( 2(81) - 27 )
= 200 - 30 - ( 162 - 27 )
= 170 - 135
= 35