13. In the arithmetic sequence -10, -7, -4, ...,98, how many terms are there?
15. In the arithmetic sequence 6, 2, -2, ..., -162, how many terms are there?
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13. In the arithmetic sequence -10, -7, -4, ...,98, how many terms are there?
15. In the arithmetic sequence 6, 2, -2, ..., -162, how many terms are there?
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Answer:
13.) ANSWER : 23 + / 2881
_________
6
- 10 n + 3/2n² - 3/2n = 98
3/2n² - 23/2n = 98
3n²-23n=196 => 3n² - 23n-196=0
b² - 4 = (-23) ² - 4x3x(-196)
n¹= 23+ 1288
_______
2x3
n¹= 23+1288
_______
6
n¹ = 23 + / 2881
_________
6
sorry 13 lang po kaya hehe hope it helps.