Question

if x=8+3 root7 find x square+1/x square​

Answer 1

Answer:

254

Step-by-step explanation:

x=8+3√7

then, 1/x=1/8+3√7

=8-3√7

therefore, x+(1/x)= (8+3√7)+(8-3√7)

=16

now, x²+1/x²=(x+1/x)²-2.x.1/x

=16²-2

=254