The explicit rule for the arithmetic sequence for the sequence is a(n) = 3n + 2.
<h3>What is a sequence?</h3>
It is defined as the systematic way of representing the data that follows a certain rule of arithmetic.
We have given:
and
![\rm a_1=5](https://tex.z-dn.net/?f=%5Crm%20a_1%3D5)
![\rm a_n-a_n_-_1= 3](https://tex.z-dn.net/?f=%5Crm%20a_n-a_n_-_1%3D%203)
The above expression represents the common ratio:
d = 3
First term:
a = 5
The explicit rule for the arithmetic sequence:
a(n) = 5 + (n - 1)3
a(n) = 3n + 2
Thus, the explicit rule for the arithmetic sequence for the sequence is a(n) = 3n + 2.
Learn more about the sequence here:
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Our discriminant is 0 so,
has one real root.
Option C is correct.
Step-by-step explanation:
we need to find the discriminant and the number of real roots for the following equation:
![4x^2 + 12x + 9 = 0](https://tex.z-dn.net/?f=4x%5E2%20%2B%2012x%20%2B%209%20%3D%200)
The discriminant is found by using square root part of quadratic formula:
![b^2-4ac](https://tex.z-dn.net/?f=b%5E2-4ac)
where b =12, a=4 and c=9
Putting values:
![=b^2-4ac\\=(12)^2-4(4)(9)\\=144-144\\=0](https://tex.z-dn.net/?f=%3Db%5E2-4ac%5C%5C%3D%2812%29%5E2-4%284%29%289%29%5C%5C%3D144-144%5C%5C%3D0)
To find out the number of real roots using discriminant we have following rules:
- if discriminant b^2-4ac >0 then 2 real roots
- if discriminant b^2-4ac =0 then 1 real root
- if discriminant b^2-4ac <0 then no real roots
Since our discriminant b^2-4ac is 0 so,
has one real root.
Option C is correct.
Keywords: discriminant
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Answer:
falls to the left and rises to the right
Step-by-step explanation:
D ( -3.5 , -1) O ( -3.5 , -3.5) G ( -3.5 , 0)