Question

if x =2+under root 5 then x 2 is​

Answer 1

Step-by-step explanation:

ANSWER

Given,

x=9+4

5

=>

x

1

=

9+4

5

1

×

9−4

5

9−4

5

=>

x

1

=9−4

5

Let y=

x

−

x

1

Squaring both sides,

y

2

=x+

x

1

−2

=>y

2

=9+4

5

+9−4

5

−2

y=+4,−4

Answer 2

Answer:

9 + 4√5

Step-by-step explanation:

x = 2 + √5

x^2 = ?

x^2 = (x)^2

= ( 2 + √5)^

(a +b)^2 = a^2 + 2ab + b^2

x^2 = (2)^2 + 2(2)(√5) + (√5)^2

= 4 + 4√5 + 5

x^2 = 9 + 4√5

I hope this will help you...plz follow