Five time of a positive integer is equal to 3 less than twice the square of that number. Find the number?
3
13
23
33
Correct Option: A
Let the number be N. According to the question, ⇒ 5N = 2N2 - 3 ⇒ 2N2 - 5N - 3 = 0 ⇒ (N - 3) ( 2N + 1 ) = 0 N = 3 and N = -1/2 Thus, the required number is 3.
