Find the 10th term of the arithmetic sequence -2x-9, -5x-5, -8x-1, ...
1 answer:
here's the solution,
<em><u>first term </u></em>(a) :
=》 -2x - 9
<em><u>common difference</u></em> (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
=》<em>-29x + 27</em>
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