Question

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

Answer 1

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 }` ⠀

so,2nd term is 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 }`

so 5th term is 74.⠀

Answer 2

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