Question

7. If x=9 - 4√5 find the value of x² +1/x²​

Answer 1

Answer:

x =9-4√5

x^2 +1/x^2

=(x+1/x)^2 -2

=(9-4√5)^2 -2

=81 +80 - 72√5 -2

= 159 -72√5

=3(53 -24√5)

#answerwithquality #BAL

Answer 2

Answer:

solution refers to the attached file

hope it helps u dear...