Level:
Project ID:
9000060607
Accepted:
1
Clonable:
0
Easy:
0
Identify the real number \(x\) which
ensures that the numbers \(a_{1} = x^{2} + 2x\),
\(a_{2} = 2x^{2} + 4x\) and
\(a_{3} = x^{2} - 2x - 8\) are
three consecutive terms of an arithmetic sequence.
\(x = -2\)
\(x = 0\)
\(x = 2\)
\(x = 4\)
\(x = -4\)