High School

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Simplify the expression:

[tex]2x^6 - x^3(x^3 - 4)[/tex]

Answer :

First, we start with the expression

[tex]$$2x^6 - x^3\left(x^3-4\right).$$[/tex]

Step 1: Expand the expression

Distribute [tex]$x^3$[/tex] inside the parentheses:

[tex]$$2x^6 - \left(x^3 \cdot x^3 - x^3 \cdot 4\right).$$[/tex]

Notice that

[tex]$$x^3 \cdot x^3 = x^6 \quad \text{and} \quad x^3 \cdot 4 = 4x^3.$$[/tex]

So the expression becomes

[tex]$$2x^6 - \left(x^6 - 4x^3\right).$$[/tex]

Now, distribute the negative sign:

[tex]$$2x^6 - x^6 + 4x^3.$$[/tex]

Combine the like terms:

[tex]$$2x^6 - x^6 = x^6,$$[/tex]

thus yielding

[tex]$$x^6 + 4x^3.$$[/tex]

Step 2: Factor the simplified expression

Observe that both terms in the expression have a common factor of [tex]$x^3$[/tex]. Factor [tex]$x^3$[/tex] out:

[tex]$$x^6 + 4x^3 = x^3\left(x^3\right) + x^3\left(4\right) = x^3(x^3 + 4).$$[/tex]

Thus, the expression can also be written as

[tex]$$x^3(x^3 + 4).$$[/tex]

Final Answer:

The expanded form is

[tex]$$x^6 + 4x^3,$$[/tex]

and the fully factored form is

[tex]$$x^3(x^3 + 4).$$[/tex]

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