Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

In a geometric sequence, the first term, 
a_(1), is equal to 6 , and the third term, 
a_(3), is equal to 96 . Which number represents the common ratio of the geometric sequence?

r=3

r=4

r=5

r=6

In a geometric sequence, the first term, a1 a_{1} , is equal to 66 , and the third term, a3 a_{3} , is equal to 9696 . Which number represents the common ratio of the geometric sequence?\newliner=3 r=3 \newliner=4 r=4 \newliner=5 r=5 \newliner=6 r=6

Full solution

Q. In a geometric sequence, the first term, a1 a_{1} , is equal to 66 , and the third term, a3 a_{3} , is equal to 9696 . Which number represents the common ratio of the geometric sequence?\newliner=3 r=3 \newliner=4 r=4 \newliner=5 r=5 \newliner=6 r=6
  1. Identify Given Terms: Identify the given terms in the geometric sequence.\newlineWe are given the first term a1a_{1} as 66 and the third term a3a_{3} as 9696. In a geometric sequence, each term is found by multiplying the previous term by the common ratio rr.
  2. Write Formula for Third Term: Write the formula for the third term of a geometric sequence.\newlineThe third term a3a_{3} can be expressed in terms of the first term a1a_{1} and the common ratio rr as follows:\newlinea3=a1r2a_{3} = a_{1} \cdot r^{2}
  3. Substitute Known Values: Substitute the known values into the formula.\newlineWe know that a1=6a_{1} = 6 and a3=96a_{3} = 96, so we can substitute these values into the formula:\newline96=6×r296 = 6 \times r^2
  4. Solve for Common Ratio: Solve for the common ratio rr. To find rr, we need to divide both sides of the equation by 66: r2=966r^2 = \frac{96}{6} r2=16r^2 = 16
  5. Take Square Root: Take the square root of both sides to solve for rr. Since r2=16r^2 = 16, we find that rr can be either positive or negative square root of 1616. However, since a common ratio is typically positive in the context of geometric sequences, we will consider the positive square root: r=16r = \sqrt{16} r=4r = 4

More problems from Find the sum of a finite geometric series