21) \( 4^{\frac{1}{2}}=2 \)
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Extra Insights
Did you know that the notation \(4^{\frac{1}{2}}\) is just another way of saying "the square root of 4"? In mathematical terms, \(x^{\frac{1}{n}}\) indicates the n-th root of x. So, when you see that, you might want to think of it as asking what number times itself gives you 4—bingo, it’s 2! In real-world applications, understanding exponents and roots helps in situations like measuring area. For example, if you have a square with an area of 4 square units, finding the side length (using \(4^{\frac{1}{2}}\)) tells you that each side is 2 units long. This knowledge is essential in architecture, landscaping, and many fields where space matters.