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The given equation is:

\[
3x^2 - 21 = 0
\]

To solve this using the square root property, follow these steps:

### Step 1: Isolate the \(x^2\) term
Add 21 to both sides of the equation:
\[
3x^2 = 21
\]

### Step 2: Divide by 3
Divide both sides of the equation by 3 to solve for \(x^2\):
\[
x^2 = 7
\]

### Step 3: Apply the square root property
Take the square root of both sides:
\[
x = \pm \sqrt{7}
\]

Thus, the solution is:
\[
x = \pm \sqrt{7}
\]

Would you like further clarification or more details on this process?

Here are five related questions:
1. How do you solve quadratic equations using the quadratic formula?
2. What is the general form of a quadratic equation?
3. How do you simplify expressions involving square roots?
4. When can you use the square root property instead of factoring?
5. What are some other methods to solve quadratic equations?

**Tip:** When using the square root property, always remember to consider both the positive and negative square roots.

Use the square root property to solve the quadratic equation: 3x^2 - 21 = 0

Learn how to solve the quadratic equation 3x^2 - 21 = 0 using the square root property. This problem involves key algebraic concepts such as isolating the x^2 term and applying the square root property. Ideal for students in Grades 9-10.

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