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Ratling [72]
3 years ago
15

Find the common ratio for the geometric sequence for which a1=3 and a5=48

Mathematics
2 answers:
Veseljchak [2.6K]3 years ago
8 0

Answer:

The common ratio for the geometric sequence is:

2

Step-by-step explanation:

In general, the terms of geometric sequence is given as:

a,ar,ar^2,ar^3,...

where a is the first term and r is the common ratio

Here, a=3

and fifth term of geometric sequence=48

i.e. ar^4=48

3r^4=48\\\\r^4=16\\\\r^4=2^4\\\\r=2

Hence, the common ratio for the geometric sequence is:

2

Rama09 [41]3 years ago
7 0

The ratio is common, so you could write:

a1 * r^4 = a^5 (you do r^4 because there are 4 times you need to multiply by the ratio to get from a1 to a5)

Plug in the values:

3 * r^4 = 48

Divide by 3:

r^4 = 16

Take the fourth root of both sides:

r = 2

The common ratio is 2.

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2 years ago
Photo attached! 10 points! Thank you in advance!!
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ax^2+bx+c=0\\\\x^2+7x+9=3\qquad|\text{subtract 3 from both sides}\\\\x^2+7x+9-3=3-3\\\\\boxed{x^2+7x+6=0\to A.}

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