Question

find x if the given numbers are in protection
(e) 9, x, x, 81​

Answer 1

Answer:

If you mean arithmetic progression, then I can answer it.

Step-by-step explanation:

9,x,x,81

This can also be written as a, a+d, a+2d, a+3d

Also, a = 9 and a+3d= 81

Solving these two equations, we get:

$putting \: a = 9 \: in \: equation \\ 9 + 3d = 81 \\ 3d = 81 - 9 \\ d = 72 \div 3 \\ d = 24$

Now we know that a+d (or x) = 9+24= 33

And a+2d= 9+2*24 = 57

Hence, the progression is 9,33,57,81