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3 years ago

Find the 10th term of the arithmetic sequence -2x-9, -5x-5, -8x-1, ...

Mathematics

1 answer:

mart [117]3 years ago

3 0

here's the solution,

first term (a) :

=》 -2x - 9

common difference (d) :

=》 -5x - 5 - (-2x - 9)

=》 -5x - 5 + 2x + 9

=》 -3x + 4

now,

10th term :

=》a + (n - 1)d

=》-2x - 9 + (10 - 1) × (-3x + 4)

=》-2x -9 + (9) × (-3x + 4)

=》-2x - 9 - 27x + 36

=》-29x + 27

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