Jika diketahui u 3 u 3 = 18 = 18 tentukanlah 1 suku pertama 2 Beda 3 suku ke-20​

Jawaban:

U3 = a + 2b = 18

U7 = a + 6b = 38

_____________ _

-4b = -20

b = -20 : -4

b = 5

a + 2b = 18

a + 2(5) = 18

a + 10 = 18

a = 18 – 10

a = 8

Penjelasan:

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