Question

find the value 11th question

Answer 1

Hey,

(x - 1/x)² = x²- 2 + 1/x²

But x² + 1/x² = 51

Thus, (x-1/x)² = 51 - 2 = 49

Therefore, x-1/x = √49 = +/-7

x-1/x = +/-7 ANSWER....

HOPE IT HELPS:-))

Answer 2

(a+1/a)² = a²+(1/a)²+ 2*a*1/a
              = 23+2
                =25
a+1/a=  +- 5