Let's evaluate the expression $4x^2 - 3x$ when $x = 3$:

1. Substitute $x = 3$ into the expression: $4(3)^2 - 3(3)$

2. Calculate $3^2$: $3^2 = 9$ So the expression becomes: $4(9) - 3(3)$

3. Multiply: $4 \times 9 = 36$ $3 \times 3 = 9$ Now, the expression is: $36 - 9$

4. Subtract: $36 - 9 = 27$

So, the correct answer is 27.

Would you like more details or have any questions?

Here are 5 related questions:

1. What is the value of $5x^2 - 4x$ when $x = 2$?
2. How do you solve a quadratic expression for a specific value of $x$?
3. What is the value of $2x^2 + 3x$ when $x = -1$?
4. How do you evaluate a polynomial expression?
5. What steps should you follow to substitute a value into an algebraic expression?

Tip: Always follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) when evaluating expressions.