9000060605
Level:
B
Identify the real number \(x\) which
ensures that the numbers \(a_{1} = x^{2} + 10\),
\(a_{2} = x^{2} + 2x\) and
\(a_{3} = x^{2}\) are
three consecutive terms of an arithmetic sequence.
\(x = 2.5\)
\(x = 0\)
\(x = 2\)
\(x = 5\)
\(x = -5\)