Question

If 2 by 7, x, - 16 by 7 are in a. P., Then X =

Answer 1

Answer:

x=-1

Step-by-step explanation:

In an AP,

$a2 - a1 = a3 - a2 \\ = > x - \frac{2}{7} = \frac{ - 16}{7} - x \\ = > \frac{7x - 2}{7} = \frac{ - 16 - 7x}{7} \\ 7x - 2 = - 16 - 7x \\ 14x = - 16 + 2 \\ 14x = - 14 \\ x = - 1$

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