5. \( \sqrt{5}-6 \sqrt{5} \)

Did you know that what you have here can be simplified? When you combine like terms, you can group your coefficients. In this case, \( \sqrt{5} - 6\sqrt{5} = (1 - 6)\sqrt{5} = -5\sqrt{5} \). It’s like collecting your favorite stickers – you just have to see how many of each you have! This expression can be quite handy! In real-world applications, such simplifications help when dealing with problems in physics or engineering where square roots pop up, particularly in calculations involving areas or distances. By simplifying expressions first, you can often see patterns or solutions that are much easier to handle. Keep your math neat!