9000060607 | math4u.vsb.cz

SubArea:

Arithmetic sequences

Level:

Project ID:

9000060607

Accepted:

1

Clonable:

0

Easy:

0

Identify the real number

x

which ensures that the numbers

a_{1} = x^{2} + 2 x

,

a_{2} = 2 x^{2} + 4 x

and

a_{3} = x^{2} - 2 x - 8

are three consecutive terms of an arithmetic sequence.

x = - 2

x = 0

x = 2

x = 4

x = - 4