For how many integer values of n will the value of the expression 2 n^2 + 1 be an integer grater than 2 and smaller than 400? (A) 14 (B) 15 (C) 16 (D) 28 (E) 32

sanju09 wrote:For how many integer values of n will the value of the expression 2 n^2 + 1 be an integer grater than 2 and smaller than 400? (A) 14 (B) 15 (C) 16 (D) 28 (E) 32 For any integer value of n, n^2 is positive.. So, 2 n^2 + 1 is always greater than 2. except for n= 0 2n^2 +1 <400 2n^2 <399 n^2<199 so n should be less than or equal to 14 or greater than or equal to -14 [14^2 = 196] so total possible values for n should be 28 [excuding 0] D

sanju09 wrote:For how many integer values of n will the value of the expression 2 n^2 + 1 be an integer grater than 2 and smaller than 400? (A) 14 (B) 15 (C) 16 (D) 28 (E) 32 2 n^2 + 1<400 2n^2<399 n^2<199 (approx) now all the number whose square less than 199 14 ^2 =196 and it will have to be greate than 2 so answer will include all the number between 1 and 14 so 14 so answer A

amising6 wrote:sanju09 wrote:For how many integer values of n will the value of the expression 2 n^2 + 1 be an integer grater than 2 and smaller than 400? (A) 14 (B) 15 (C) 16 (D) 28 (E) 32 2 n^2 + 1 2, n cannot take 0; hence, on the number line, all integers from -14 to 14 EXCEPT 0 fulfill the need. Is it still A, man?

sanju09 wrote:amising6 wrote:sanju09 wrote:For how many integer values of n will the value of the expression 2 n^2 + 1 be an integer grater than 2 and smaller than 400? (A) 14 (B) 15 (C) 16 (D) 28 (E) 32 2 n^2 + 1 2, n cannot take 0; hence, on the number line, all integers from -14 to 14 EXCEPT 0 fulfill the need. Is it still A, man? no dude my case was only for positve integer if you include negative integr it will be 28 thanks