Question

If x=
$9 + 4 \sqrt{5}$
find the value of
$x {}^{2} + \frac{1}{x {}^{2} }$
​

Answer 1

Answer:

Step-by-step explanation:

p(x) = 2 {x}^{2}  + ax +  \sqrt{2}  

p(1) = 2 {(1)}^{2}  + a(1) +  \sqrt{2}  

0 = 2 + a +  \sqrt{2}  

a =  - 2 -  \sqrt{2}