Question

[7root-3root] [7root+3root]

Answer 1

Answer:

• 4

Solution:

We know that,

$\red\bigstar\;\;\;\green{\boxed{\sf (a+b)(a-b)=a^2-b^2}}$

We can use this identity here,

Let  

• $\sf a= \sqrt{7}$

• $\sf b=\sqrt{3}$

Appling ,

$\implies\sf (\sqrt{7}-\sqrt{3})(\sqrt{7}+\sqrt{3}) \\\\\implies\sf (\sqrt{7}^2-\sqrt{3}^2)\\\\\implies\sf 7 - 3 \\\\\implies\sf \pink {4 }$