Final answer:
The expression 5V5 - 2*15, assuming it represents 5√5 - 2√15, is already simplified as the surds cannot be directly combined.
Step-by-step explanation:
To simplify the following surd expression 5V5 - 2*15, assuming it's meant to be 5√5 - 2√15, we first note that the surds are already in their simplest form and cannot be combined since they have different radicands.
A surd is an expression that includes a square root, cube root, etc. that cannot be simplified to an entire number. In this case, the expression remains 5√5 - 2√15 as the simplified form, since √5 and √15 are different and cannot be added or subtracted directly.