MathRevolution wrote:
If x+(1/x)=4, \(x^2+(1/x^2)\)=?
A. 10
B. 12
C. 14
D. 16
E. 18
(x+1/x)^2 = X^2+2+1/x^2;
So x^2+1/x^2 = 16- 2 = 14;
Ans:C
If x+(1/x)=4, \(x^2+(1/x^2)\)=?
A. 10
B. 12
C. 14
D. 16
E. 18
(x+1/x)^2 = X^2+2+1/x^2;
So x^2+1/x^2 = 16- 2 = 14;
Ans:C
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