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The expression given is:

\[
3 \sqrt{7} - 5 \sqrt{7}
\]

Since both terms contain the same radical, \( \sqrt{7} \), you can treat them as like terms. Combine the coefficients of the radicals:

\[
(3 - 5) \sqrt{7} = -2 \sqrt{7}
\]

Thus, the simplified form of the expression is:

\[
\boxed{-2 \sqrt{7}}
\]

The correct answer is **A**.

Would you like more details, or have any questions?

Here are 5 related questions to consider:
1. How do you add or subtract terms with different radicals?
2. What happens when multiplying two radicals, such as \( \sqrt{7} \times \sqrt{7} \)?
3. How can you rationalize a denominator that contains a square root?
4. How do you simplify an expression like \( 3 \sqrt{7} \times 5 \sqrt{7} \)?
5. What are the steps to simplify \( \sqrt{28} \)?

**Tip:** When dealing with radicals, always check if they are "like" terms (having the same radicand) to simplify correctly!

What is the simplified form of 3√7 - 5√7?

Learn how to simplify the expression 3√7 - 5√7 by combining like terms. This problem focuses on algebraic concepts involving radicals and their properties, making it suitable for students in Grades 7-10.

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