Step-by-step explanation:
1. r = n-k √an / ak
= 4 -1 √ 686 / 2
= 3√343
= 7
a2 = a1 • r
= 2 x 7
= 14
a3 = 14 x 7
= 98
2.) {3,___,27}
[tex] \frac{a3}{a2} = \frac{a2}{a1} \\ \frac{27}{a2} = \frac{a2}{3} \\ (a2)^{2} = 81 \\ \sqrt {a2}^{2} = \sqrt{81 \\ } \\ a2 = 9[/tex]
3. ) {1/2 , ___, 1/8}
(same formula above)
a3/a2 = a2/a1
⅛ / a2 = a2 / ½
(a2)² = ⅛ x ½
(a2)² = 1/16
√a2² = √1/16
a2 = 1/4
4. {1, __,___,___, 81}
r = n-k √ an/ ak
= 5 - 1 √ 81 / 1
= 4√ 81
r = 3
a2 = 1 x 3
= 3
a3 = 3 x 3
= 9
A4 = 9 x 3
= 27
5.) {2, ___, ½, ____ , ⅛}
(same formula with number 2)
½ / a2 = a2 / 2
(a2)² = 2/2 = 1
√a2² = √1
a2 = 1
a5/a4 = a4/a3
⅛ / a4 = a4 = ½
(a4)² = 1/16
√a4² = √1/16
a4 = 1/4
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Answers & Comments
Verified answer
Step-by-step explanation:
1. r = n-k √an / ak
= 4 -1 √ 686 / 2
= 3√343
= 7
a2 = a1 • r
= 2 x 7
= 14
a3 = 14 x 7
= 98
2.) {3,___,27}
[tex] \frac{a3}{a2} = \frac{a2}{a1} \\ \frac{27}{a2} = \frac{a2}{3} \\ (a2)^{2} = 81 \\ \sqrt {a2}^{2} = \sqrt{81 \\ } \\ a2 = 9[/tex]
3. ) {1/2 , ___, 1/8}
(same formula above)
a3/a2 = a2/a1
⅛ / a2 = a2 / ½
(a2)² = ⅛ x ½
(a2)² = 1/16
√a2² = √1/16
a2 = 1/4
4. {1, __,___,___, 81}
r = n-k √ an/ ak
= 5 - 1 √ 81 / 1
= 4√ 81
r = 3
a2 = 1 x 3
= 3
a3 = 3 x 3
= 9
A4 = 9 x 3
= 27
5.) {2, ___, ½, ____ , ⅛}
(same formula with number 2)
a3/a2 = a2/a1
½ / a2 = a2 / 2
(a2)² = 2/2 = 1
√a2² = √1
a2 = 1
a5/a4 = a4/a3
⅛ / a4 = a4 = ½
(a4)² = 1/16
√a4² = √1/16
a4 = 1/4