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What is the product?

[tex]\[ \frac{2a - 7}{a} \cdot \frac{3a^2}{2a^2 - 11a + 14} \][/tex]

A. [tex]\(\frac{3}{a - 2}\)[/tex]

B. [tex]\(\frac{3a}{a - 2}\)[/tex]

C. [tex]\(\frac{3a}{a + 2}\)[/tex]

D. [tex]\(\frac{3}{a + 2}\)[/tex]


Sagot :

Sure, let's analyze and simplify the given expression step-by-step.

We need to determine the product of:
[tex]\[ \frac{2a - 7}{a} \times \frac{3a^2}{2a^2 - 11a + 14} \][/tex]

### Step 1: Factorize and Simplify

1. Identify the factorization of the denominator [tex]\(2a^2 - 11a + 14\)[/tex].

To factorize [tex]\(2a^2 - 11a + 14\)[/tex], we look for two numbers whose product is [tex]\(2 \times 14 = 28\)[/tex] and whose sum is [tex]\(-11\)[/tex]. These numbers are [tex]\(-4\)[/tex] and [tex]\(-7\)[/tex].

Split the middle term:
[tex]\[ 2a^2 - 4a - 7a + 14 \][/tex]

Group the terms:
[tex]\[ (2a^2 - 4a) - (7a - 14) \][/tex]

Factor each group:
[tex]\[ 2a(a - 2) - 7(a - 2) \][/tex]

Factor out the common term [tex]\((a - 2)\)[/tex]:
[tex]\[ (2a - 7)(a - 2) \][/tex]

So, [tex]\( 2a^2 - 11a + 14 = (2a - 7)(a - 2) \)[/tex].

### Step 2: Rewrite the Expression

Rewrite the original product using the factorization:
[tex]\[ \frac{2a - 7}{a} \times \frac{3a^2}{(2a - 7)(a - 2)} \][/tex]

### Step 3: Simplify the Expression

Now, cancel common factors:
The [tex]\((2a - 7)\)[/tex] term in the numerator and denominator cancel out:
[tex]\[ \frac{2a - 7}{a} \times \frac{3a^2}{(2a - 7)(a - 2)} = \frac{1}{a} \times \frac{3a^2}{a - 2} = \frac{3a^2}{a(a - 2)} \][/tex]

Further simplifying:
[tex]\[ \frac{3a^2}{a(a - 2)} = \frac{3a}{a - 2} \][/tex]

### Step 4: Identify the Correct Option

The simplified product of:
[tex]\[ \frac{2a - 7}{a} \times \frac{3a^2}{(2a - 7)(a - 2)} \][/tex]
is:
[tex]\[ \frac{3a}{a - 2} \][/tex]

So, the answer is:
[tex]\[ \frac{3a}{a - 2} \][/tex]