The question is-
4 √3 - 2 √2
7 √5
I think your question is
$\displaystyle
\frac{4(\sqrt{3}-2\sqrt{2})}{7\sqrt{5}}
$
Multiply numerator and denominator with $\displaystyle \sqrt{5}$
So the value becomes
$\displaystyle
=\frac{4\sqrt{5}(\sqrt{3}-2\sqrt{2})}{7(\sqrt{5})^2}
$
$\displaystyle
=\frac{4(\sqrt{5\times 3}-2\sqrt{2\times 5})}{35}
$
$\displaystyle
=\frac{4(\sqrt{15}-2\sqrt{10})}{35}
$
that's the answer
Now one more thing, you will find it really better if you learn Latex