If x + y = 7 and xy = 6,
the value of (x3 + y3) is :
Option :
A. 91
B. 133
C. 217
D. 343
Option C
If $x + y = 7$ and xy = 12,
the value of $(x^2 + y^2)$ is :
Option :
A. 25
B. 29
C. 37
D. 49
Option A
If (x + 1/x) = 3, then (x2 + 1/x2) is equal to :
Option :
A. 10 / 3
B. 82 / 9
C. 7
D. 11
Option C
If (x - 1/x) = 1/2 , then (4x2 + 4/x2) is equal to :
Option :
A. 7
B. - 7
C. 9
D. - 9
Option C
If (x + 1/x) = 4, then (x4 + 1/x4) is equal to :
Option :
A. 196
B. 194
C. 192
D. 190
Option B