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I just need to know the work

Radical 63 13 radical 98-5 radical 112

I will assume you mean
$\sqrt{63}+13\sqrt{98}-5\sqrt{112}$ .

You have $63=9\times 7$ , thus $\sqrt{63}=\sqrt{9\times 7}=\sqrt{9}\times\sqrt{7}<br /> =3\sqrt{7}$ . Similarly $\sqrt{98}=7\sqrt{2}=\sqrt{14}\sqrt{7}$
and $\sqrt{112}=4\sqrt{7}$ .
From here you can work your way. If you have any doubt repost.

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