Tolong di jawab cepat ya, mau dikumpulin ​

Jawaban:

SOAL A

U12 = 3(12)² + 1

U12 = 3 × 144 + 1

U12 = 433

U20 = 3(20)² + 1

U20 = 3 × 400 + 1

U20 = 1.201

U35 = 3(35)² + 1

U35 = 3 × 1225 + 1

U35 = 3.676

SOAL B

U12 + U20

(3(12)² + 1) + (3(20)² + 1)

= 433 + 1201

= 1634