(−$$ 3x^2 $$+3*x*−8)+($$ {\displaylines\\ } $$$$ 6x^2 $$−4*x*)

Let's break down and simplify the given expression step by step:

Expression:  
\[
(-3x^2 + 3x \cdot (-8)) + (6x^2 - 4x)
\]

### Step 1: Simplify each term inside the parentheses.
1. The first part is:  
   \[
   -3x^2 + 3x \cdot (-8) = -3x^2 - 24x
   \]

2. The second part is:  
   \[
   6x^2 - 4x
   \]

### Step 2: Combine like terms.
Now, combine the two parts:

\[
(-3x^2 - 24x) + (6x^2 - 4x)
\]

Combine the $x^2$ terms and the $x$ terms:

\[
(-3x^2 + 6x^2) + (-24x - 4x) = 3x^2 - 28x
\]

### Final Answer:
\[
3x^2 - 28x
\]

Would you like more details, or do you have any questions?

Here are five related questions:
1. How do you factor the expression $3x^2 - 28x$?
2. What is the solution to $3x^2 - 28x = 0$?
3. How does this simplification change for different coefficients?
4. What happens if we include a constant term in this expression?
5. How does the quadratic term affect the shape of the graph?

**Tip:** Always combine like terms carefully to simplify complex expressions efficiently.

The query submitted by the user: (-3x^2 + 3*x*(-8)) + (6x^2 - 4*x)

This guide explains how to simplify the expression (-3x^2 + 3x(-8)) + (6x^2 - 4x) step-by-step. Learn the key algebraic concepts of combining like terms and applying the distributive property. Suitable for students in Grades 7-9.

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