High School

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Multiply the following expression:

[tex](x^2 - 5x)(2x^2 + x - 3)[/tex]

Choose the correct option:

A. [tex]4x^4 + 9x^3 - 8x^2 + 15x[/tex]

B. [tex]2x^4 - 9x^3 - 8x^2 + 15x[/tex]

C. [tex]2x^4 + 9x^3 - 8x^2 + 15x[/tex]

D. [tex]2x^4 - 9x^3 - 9x^2 - 15x[/tex]

Answer :

To find the result of multiplying [tex]\((x^2 - 5x)\)[/tex] and [tex]\((2x^2 + x - 3)\)[/tex], we need to use the distributive property to expand the expression. Here's how you can do it step by step:

1. Distribute [tex]\(x^2\)[/tex]:

We first distribute [tex]\(x^2\)[/tex] to each term in the second polynomial:
[tex]\[
x^2 \cdot (2x^2 + x - 3) = 2x^4 + x^3 - 3x^2
\][/tex]

2. Distribute [tex]\(-5x\)[/tex]:

Next, distribute [tex]\(-5x\)[/tex] to each term in the second polynomial:
[tex]\[
-5x \cdot (2x^2 + x - 3) = -10x^3 - 5x^2 + 15x
\][/tex]

3. Combine all the terms:

Combine all the terms from the above results:
[tex]\[
2x^4 + x^3 - 3x^2 - 10x^3 - 5x^2 + 15x
\][/tex]

4. Simplify by combining like terms:

Group and combine the like terms to simplify:
- The [tex]\(x^4\)[/tex] term: [tex]\(2x^4\)[/tex]
- The [tex]\(x^3\)[/tex] terms: [tex]\(x^3 - 10x^3 = -9x^3\)[/tex]
- The [tex]\(x^2\)[/tex] terms: [tex]\(-3x^2 - 5x^2 = -8x^2\)[/tex]
- The [tex]\(x\)[/tex] term: [tex]\(15x\)[/tex]

So, the final expanded and simplified expression is:
[tex]\[
2x^4 - 9x^3 - 8x^2 + 15x
\][/tex]

Therefore, from the given options, the correct answer is:

B. [tex]\(2x^4 - 9x^3 - 8x^2 + 15x\)[/tex]

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