exam Maths Puzzle Numerical Ability

I have to simplify this; sqrt20/5-1/sqrt5

I keep coming up with that this cannot be simplified, am I on the right track.
my result is
=15sqrt5/100
please help

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exam Other Question

Please help me with this problem.
Find a quadratic function with solutions -5+2i and -5-2i and a leading coefficient of 1. how can u simplfy radicals when there are variables involved and there is a number on the outside of the square root?