Answer:
that confusing
Step-by-step explanation:
First 5 terms are: -1,0,3,8,15
Step-by-step explanation:
we will put n=1,2,3,4,5 to find first 5 terms of the sequence
Explicit formula for sequence is:

Putting n=1

Putting n=2

Putting n=3

Putting n=4

Putting n=5

Hence,
First 5 terms are: -1,0,3,8,15
Keywords: Arithmetic sequence, Common difference
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Answer:
x = ±2
Step-by-step explanation:
3x ^2 -4 = 8
Add 4 to each side
3x ^2 -4+4 = 8+4
3x^2 =12
Divide each side by 3
3x^2 =12
3x^2/3 = 12/3
x^2 = 4
Take the square root of each side
sqrt(x^2) = ±sqrt(4)
x = ±2