3n^2-1 find the 2nd and 5th term

Question

asked Jul 23, 2022 87.3k views

2 Answers

Olawalejuwonm · Answer 1 · 2022-07-23T17:05:32+0000

Explanation:

in
$\tt{3n^2-1 }$ ⠀

If n=2

so,

2nd term=⠀

$\rightsquigarrow$
$\tt{3×2^2-1 }$ ⠀

$\rightsquigarrow$
$\tt{ 3×4-1 }$ ⠀

$\rightsquigarrow$
$\tt{ 12-1 }$ ⠀

$\rightsquigarrow$
$\tt{ 11 }$ ⠀

If n=5

so,

5th term =

$\rightsquigarrow$
$\tt{ 3×5^2-1 }$ ⠀

$\rightsquigarrow$
$\tt{ 3×25-1 }$ ⠀

$\rightsquigarrow$
$\tt{75-1 }$ ⠀

$\rightsquigarrow$
$\tt{74 }$

UnknownOctopus · Answer 2 · 2022-07-27T16:05:08+0000

Answer:

2nd term = 11

5th term = 74

Explanation:

3n² - 1

n = 2 , 2nd term = 3*2² - 1

= 3*4 -1

= 12 - 1

= 11

n= 5 , 5th term = 3*5² - 1

= 3*25 - 1

= 75 - 1

= 74