Last Updated :
20 Nov, 2018
Given √224r = 13r the value of radix r is
(A) 10
(B) 8
(C) 6
(D) 5
Answer: (D)
Explanation:
√224r = 13r
taking square both sides
2r2 + 2r + 4 = r2 + 6r + 9
= r2 - 4r - 5 = 0
= (r - 5)(r + 1) = 0
r = 5 // since it can\'t be -1
So, option (D) is correct.
Quiz of this Question
Share your thoughts in the comments
Please Login to comment...