High School

Select the correct answer.

Simplify the expression [tex]-4x^2(3x - 7)[/tex].

A. [tex]-12x^3 + 28x^2[/tex]
B. [tex]-12x^3 - 28[/tex]
C. [tex]-12x^3 - 28x^2[/tex]
D. [tex]-12x^3 + 28[/tex]

Answer :

Let's simplify the expression [tex]\(-4x^2(3x-7)\)[/tex] step-by-step:

1. Distribute [tex]\(-4x^2\)[/tex] across the terms inside the parentheses:

- Multiply [tex]\(-4x^2\)[/tex] by [tex]\(3x\)[/tex]:
[tex]\[
-4x^2 \times 3x = -12x^3
\][/tex]

- Multiply [tex]\(-4x^2\)[/tex] by [tex]\(-7\)[/tex]:
[tex]\[
-4x^2 \times (-7) = 28x^2
\][/tex]

2. Combine the results from the multiplication:

The expression becomes:
[tex]\[
-12x^3 + 28x^2
\][/tex]

Therefore, the simplified expression is [tex]\(-12x^3 + 28x^2\)[/tex].

Based on the options given, the correct answer is:
- A. [tex]\(-12 x^3 + 28 x^2\)[/tex].