Diketahui Un=2n2-5 nilai Dari U15+U20?

U15 = 2(15)² – 5 = 445

U20 = 2(20)² – 5 = 795

U15 + U20 = 1240

U15=2n²-5

U15=2(15)²-5

U15=450-5

U15=445

U20=2n²-5

U20=2.20²-5

U20=800-5

U20=795

U15+U20=445+795=1240