Home » Aptitude » Algebra » Question
  1. If   x = √3
    1
    and y = √3 +
    1
    , then the value of
    x2
    +
    y2
    is
    33yx
    1. 3
    2. 3√3
    3. 16√3
    4. 2√3
Correct Option: B

x = √3
1
3

y = √3 +
1
3

x + y = √3
1
+ √3 +
1
= 2√3
33

xy = 3
1
3 +
1
33

= 3 –
1
=
9 − 1
=
8
333

∴ 
x2
+
y2
=
x3 + y3
yxxy

=
(x + y)3 − 3xy(x + y)
xy

= (2√3)3 − 3 ×
8
(2√3)
3
8
3

=
24√3 − 16√3
8/3

=
8√3 × 3
= 3√3
8



Your comments will be displayed only after manual approval.