If $$\sqrt \text x+10=\sqrt{529}$$​, then the value of x is:

Correct option is B

Given:​

​$$\sqrt \text x+10=\sqrt{529}$$ 

Solution: 

$$\sqrt \text x+10=\sqrt{529}$$​

​$$\sqrt \text x=\sqrt{529}-10$$

​​$$\sqrt \text x = 23 -10$$ = 13

Squaring both sides, 

x = (13)² = 169