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Select the correct answer.

Which expression in factored form is equivalent to this expression?

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

A. [tex]\((2x + 3)(x - 1 - 1)\)[/tex]

B. [tex]\(2(x + 1)(x + 3)\)[/tex]

C. [tex]\(2(x - 1)(x - 3)\)[/tex]

D. [tex]\((2x - 3)(x + 1)\)[/tex]


Sagot :

To find the correct factored form of the expression [tex]\( 4(x^2 - 2x) - 2(x^2 - 3) \)[/tex], let's break down the problem step by step.

1. Expand the given expression:
[tex]\[ 4(x^2 - 2x) - 2(x^2 - 3) \][/tex]
First, distribute the constants inside the parentheses:
[tex]\[ 4 \cdot x^2 - 4 \cdot 2x - 2 \cdot x^2 - 2 \cdot (-3) \][/tex]
This simplifies to:
[tex]\[ 4x^2 - 8x - 2x^2 + 6 \][/tex]

2. Combine like terms:
[tex]\[ (4x^2 - 2x^2) + (-8x) + 6 \][/tex]
Simplify the terms within each group:
[tex]\[ 2x^2 - 8x + 6 \][/tex]

3. Factor the simplified expression [tex]\(2x^2 - 8x + 6\)[/tex]:
We want to factor this quadratic expression. To do this, look for two numbers that multiply to [tex]\(2 \times 6 = 12\)[/tex] and add up to [tex]\(-8\)[/tex].

The numbers [tex]\(-6\)[/tex] and [tex]\(-2\)[/tex] satisfy these conditions:
[tex]\[ 2x^2 - 8x + 6 = 2x^2 - 6x - 2x + 6 \][/tex]
Factor by grouping:
[tex]\[ 2x(x - 3) - 2(x - 3) \][/tex]
Factor out the common factor [tex]\((x - 3)\)[/tex]:
[tex]\[ (2x - 2)(x - 3) \][/tex]
Further factor out the 2 from [tex]\(2x - 2\)[/tex]:
[tex]\[ 2(x - 1)(x - 3) \][/tex]

Hence, the factored form of the expression [tex]\(4(x^2 - 2x) - 2(x^2 - 3)\)[/tex] is [tex]\(2(x - 1)(x - 3)\)[/tex].

The correct answer is:
[tex]\[ \boxed{2(x-1)(x-3)} \][/tex]
So, the correct choice is:
[tex]\[ \boxed{\text{C. } 2(x-1)(x-3)} \][/tex]