top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What is the value of the folowing?

+1 vote
110 views

What is the value of:
(7 + sqrt(50))^(1/3) + (7 - sqrt(50))^(1/3)
[ Do not use calculator ]

posted Nov 11, 2018 by Tejas Naik

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+1 vote
 
Best answer

2


I use here v instead of sqrt for better visibility:
7 + v50=7+5v2=1+3v2+6+2v2=(1+v2)^3 --->(1)
7 - v50=7-5v2=1-3v2+6-2v2=(1-v2)^3 ---> (2)
Using above equations in given one we get :
(1) ^(1/3)=1+v2
(2) ^(1/3)=1-v2
1+v2+1-v2=2

answer Nov 11, 2018 by Hanifa Mammadov



Similar Puzzles
0 votes

What is the value of x in the figure below?
enter image description here

0 votes

What is the value of the following sum?
S = 12/21 + 22/22 + 32/23 + … + n2/2n + …

0 votes

If ABCDE times 4 equals EDCBA, and each letter is a different digit from 0 to 9, what is the value of each letter?
enter image description here

...