Question

Ifx=2+√5 then x^2 is ?????

Answer 1

Answer:

$x=2+\sqrt{5}$

$x^2=(2+\sqrt{5})^2$

    $=4+4\sqrt{5}+5$

    $=9+4\sqrt{5} \: \:\:\:\: ANSWER$

$@rohangupta0424$

Answer 2

Step-by-step explanation:

given

x=2+√5

x²=?

we know that [(a+b)²=a²+b²+2ab]

here,

a=2 ; b=√5

by taking this in mind,we get

(2+√5)²=2²+(√5)²+2(2)(√5)

(2+√5)²=4+5+4√5

(2+√5)²=9+4√5