Question

answer this question ​

Answer 1

Answer:

option (D) 255

Step-by-step explanation:

Given,

T (n) = 4n²- 1

so ,

T(8) = 4× 8²-1

= 256- 1

= 255

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Answer 2

Answer:

255

Step-by-step explanation:

n(th)= 4n^2 - 1 = (2n+1)(2n -1)

8th = (2*8+1)(2*8-1)

8th = 17 *15 = 255