Select the correct answer.

Which expression is equivalent to the given polynomial expression?

[tex]\[ (g-h)\left(g^2-3 g h+2 h^2\right) \][/tex]

A. [tex]\[ g^3-2 h^3 \][/tex]

B. [tex]\[ g^3+4 g^2 h^2-2 h^3 \][/tex]

C. [tex]\[ g^3-4 g^2 h+5 g h^2-2 h^3 \][/tex]

D. [tex]\[ g^3-2 g^2 h+g h^2-2 h^3 \][/tex]



Answer :

To determine which expression is equivalent to the given polynomial expression, [tex]\((g-h)(g^2 - 3gh + 2h^2)\)[/tex], we need to expand and simplify it step by step.

Let's begin by performing the multiplication:

1. First Distribution:
[tex]\[ (g - h) \cdot (g^2 - 3gh + 2h^2) \][/tex]

2. Distribute [tex]\(g\)[/tex]:
[tex]\[ g \cdot (g^2 - 3gh + 2h^2) = g \cdot g^2 + g \cdot (-3gh) + g \cdot 2h^2 = g^3 - 3g^2h + 2gh^2 \][/tex]

3. Distribute [tex]\(-h\)[/tex]:
[tex]\[ -h \cdot (g^2 - 3gh + 2h^2) = -h \cdot g^2 + (-h) \cdot (-3gh) + (-h) \cdot 2h^2 = -hg^2 + 3gh^2 - 2h^3 \][/tex]

4. Combine Like Terms:
[tex]\[ g^3 - 3g^2h + 2gh^2 - hg^2 + 3gh^2 - 2h^3 \][/tex]

5. Simplify:
- Combine the [tex]\(g^2h\)[/tex] terms:
[tex]\[ - 3g^2h - hg^2 = -4g^2h \][/tex]
- Combine the [tex]\(gh^2\)[/tex] terms:
[tex]\[ 2gh^2 + 3gh^2 = 5gh^2 \][/tex]

6. Final Expression:
[tex]\[ g^3 - 4g^2h + 5gh^2 - 2h^3 \][/tex]

Therefore, the expression that matches our simplified polynomial is:

C. [tex]\(g^3 - 4g^2h + 5gh^2 - 2h^3\)[/tex]