It looks like you might be trying to express the equation \(3(7x + x^2)\). I'll assume that's what you intended.

To simplify this expression, distribute the 3 across both terms inside the parentheses:

\[
3(7x + x^2) = 3 \cdot 7x + 3 \cdot x^2 = 21x + 3x^2
\]

So, the simplified expression is \(21x + 3x^2\).

Would you like to see more details or have any questions?

Here are five related questions:
1. How would you solve the equation \(3(7x + x^2) = 0\) for \(x\)?
2. What is the value of the expression \(21x + 3x^2\) when \(x = 2\)?
3. How do you factor the expression \(21x + 3x^2\)?
4. What happens if you add a constant, say 5, to the expression \(21x + 3x^2\)?
5. How do you find the derivative of \(21x + 3x^2\) with respect to \(x\)?

**Tip:** When simplifying expressions, always make sure to distribute coefficients correctly to each term within parentheses.

Learn how to simplify the expression 3(7x + x^2) step-by-step. This problem covers the distributive property in algebra, focusing on simplifying expressions with coefficients and variables. Suitable for students in Grades 7-9.

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