Question

B3=28 , q=-2 знайти b1​

Answer 1

24,,,,,,,,,,,,,,,,,

Answer 2

To find the value of B1, we can use the formula for an arithmetic sequence:

Bn = B1 + (n - 1) * d

where: Bn is the nth term of the sequence, B1 is the first term of the sequence (which we want to find), n is the position of the term we want to find, d is the common difference between consecutive terms.

In this case, we are given B3 = 28, and the common difference q = -2.

Substitute the given values into the formula:

B3 = B1 + (3 - 1) * (-2)

Now, simplify the equation:

28 = B1 + 2 * (-2)

28 = B1 - 4

Now, isolate B1 by adding 4 to both sides:

B1 = 28 + 4

B1 = 32

So, the first term of the arithmetic sequence (B1) is 32.