Geometric sequences

9000068703

Level:

Identify the real number

x

which converts the numbers

a_{1} = - x

a_{2} = - 5

and

a_{3} = 5

into three consecutive numbers of a geometric series.

x = - 5

x = 0

x = 5

x = - 10

x = 10

Level:

Identify the real number

x

which converts the numbers

a_{1} = 2^{x - 4}

a_{2} = 1

and

a_{3} = 2^{x}

into three consecutive terms of a geometric series.

x = 2

x = 1

x = \log 2

x = 10

x = 100

Level:

Identify the real number

x

which converts the numbers

a_{1} = x - 6

a_{2} = x

and

a_{3} = - x

into three consecutive numbers of a geometric series.

x = 3

x = 0

x = 2

x = 2.5

x = - 12