Question

Pre-Calculus: Find the missing term of the arithmetic sequence: 19,_, _,-71

Answer 1

The missing TERMS or term

Answer 2

Oh, sorry. It should have read "terms".

Answer 3

Arithmetic sequence \[A_n= A_1 + (n-1)d\]

Answer 4

First you would have to find the difference which i believe can be done by using -71

Answer 5

Since -71 is the 4th term then you can solve for d in the formula

Answer 6

\[-71_{4th} = 19 + (4th-1)d\]

Answer 7

Alright, I'll try it and find d.

Answer 8

-71=19+(4-1)d
-71=3d+19
-90=3d
d=-30

Answer 9

Thanks!

Answer 10

Correct!

Answer 11

Now you can solve for the missing terms with the difference known. Great Job!