In Exercises 47 - 49, add or subtract terms whenever possible. 4√72 - 2√48

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Start by simplifying each square root term separately. Break down the numbers inside the radicals into their prime factors or perfect squares. For example, express 72 as a product of a perfect square and another number: \(72 = 36 \times 2\).

Rewrite the square roots using the property \(\sqrt{a \times b} = \sqrt{a} \times \sqrt{b}\). So, \(\sqrt{72} = \sqrt{36 \times 2} = \sqrt{36} \times \sqrt{2}\) and \(\sqrt{48} = \sqrt{16 \times 3} = \sqrt{16} \times \sqrt{3}\).

Calculate the square roots of the perfect squares: \(\sqrt{36} = 6\) and \(\sqrt{16} = 4\). Substitute these back into the expression to get \(4 \times 6 \sqrt{2} - 2 \times 4 \sqrt{3}\).

Multiply the coefficients outside the radicals: \(4 \times 6 = 24\) and \(2 \times 4 = 8\). So the expression becomes \(24 \sqrt{2} - 8 \sqrt{3}\).

Since \(\sqrt{2}\) and \(\sqrt{3}\) are unlike terms (different radicals), you cannot combine them further. The simplified expression is \(24 \sqrt{2} - 8 \sqrt{3}\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Simplifying Radicals

Simplifying radicals involves expressing the radicand (the number inside the square root) as a product of perfect squares and other factors. This allows you to take the square root of the perfect square separately, simplifying the expression. For example, √72 can be rewritten as √(36×2) = 6√2.

Like Radicals

Like radicals have the same radicand and index, which means they can be combined through addition or subtraction. For instance, 4√2 and 2√2 are like radicals and can be combined as (4 - 2)√2 = 2√2. Identifying like radicals is essential for simplifying expressions involving roots.

Combining Like Terms

Combining like terms means adding or subtracting coefficients of terms that have the same variable or radical part. After simplifying radicals, you combine terms with identical radicals by performing arithmetic on their coefficients. This step reduces the expression to its simplest form.