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S1 Mathe question

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發問:

1.It is given that the general term of the sequence 7, 2. -3, ........is An= P-5n a) Find the value of P b) Hence, use the result of (a) to find the difference between the 5th and the 10th term of the sequence. Please help me to solve it.

最佳解答:

a) p- 5(1) = 7 so, p = 12 b) 5 th term and 10th term 5th term = 12-5(5) = -13 10th term = 12-5(10) = -38 so, -13-(-38) = 25

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