we need to find value of x and it is given to us that $$\sqrt{1+\frac{x}{961}} = \frac{32}{31}$$
$$\frac{32}{31}$$ = $$\sqrt{\frac{1024}{961}}$$
hence ,
$$\sqrt{1+\frac{x}{961}}$$ = $$\sqrt{\frac{1024}{961}}$$ = $$\sqrt{1 + \frac{63}{961}}$$
hence x = 63
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