Question

If x = 2+3√5 then find x2 + 1 x2

Answer 1

hello ..
x2 = (2+ 3√5)^2
=4 + 45+6√5
= 49+ 6√5
now,
x2 + x2= 49 + 6√5 + 49+6√5= 98+12√5..
I hope it help you....

Answer 2

x=2+3√5

x²+x²

(2+3√5)²+(2+3√5)²

following identity
(a+b)²=a²+b²+2ab


4+(3√5)²+2×2×3√5+4+(3√5)²+2×2×3√5

=4+45+12√5+4+45+12√5

=98+24√5