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Simplify the expression:

[tex]\((x^2-2)(-5x^2 + x) = (x^2)(-5x^2) + (x^2)(x) + (-2)(-5x^2) + (-2)(x)\)[/tex]

This is an example of:

A. Vertical multiplication
B. Dividing two binomials
C. FOIL
D. Complex conjugates


Sagot :

To tackle the problem, we need to understand the provided expression and identify the method used to simplify it. The given expression is [tex]\((x^2 - 2)(-5x^2 + x)\)[/tex].

First, let's rewrite it:
[tex]\[ (x^2 - 2)(-5x^2 + x) \][/tex]

We have a product of two binomials, and it is simplified using the method outlined in the question:
[tex]\[ (x^2)(-5x^2) + (x^2)(x) + (-2)(-5x^2) + (-2)(x) \][/tex]

Each term in the first binomial [tex]\(x^2 - 2\)[/tex] is multiplied by each term in the second binomial [tex]\(-5x^2 + x\)[/tex]. Let's analyze the terms one-by-one:

1. First Terms:
[tex]\[ (x^2)(-5x^2) = -5x^4 \][/tex]

2. Outer Terms:
[tex]\[ (x^2)(x) = x^3 \][/tex]

3. Inner Terms:
[tex]\[ (-2)(-5x^2) = 10x^2 \][/tex]

4. Last Terms:
[tex]\[ (-2)(x) = -2x \][/tex]

By observing the multiplication pattern, we see that it follows the steps First, Outer, Inner, Last. This is a classic example of the FOIL method used for multiplying binomials.

Thus, the correct answer is:
[tex]\[ \boxed{\text{C. FOIL}} \][/tex]