Simplify [tex]1 + \frac{3}{2x - 1} - \frac{x - 1}{6x^2 - 3x}[/tex].

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

B. [tex]\frac{(3x + 1)(2x + 1)}{3x(2x - 1)}[/tex]

C. [tex]\frac{3x + 1}{3x}[/tex]

D. [tex]\frac{2x + 1}{2x - 1}[/tex]



Answer :

Let's simplify the given expression step-by-step. The expression is:

[tex]\[ 1 + \frac{3}{2x - 1} - \frac{x - 1}{6x^2 - 3x} \][/tex]

First, let's break down the components:

1. Consider the term \(\frac{x - 1}{6x^2 - 3x}\):
The denominator \(6x^2 - 3x\) can be factored out:
[tex]\[ 6x^2 - 3x = 3x(2x - 1) \][/tex]
So, [tex]\[ \frac{x - 1}{6x^2 - 3x} = \frac{x - 1}{3x(2x - 1)} \][/tex]

2. Now substitute this back into the original expression:
[tex]\[ 1 + \frac{3}{2x - 1} - \frac{x - 1}{3x (2x - 1)} \][/tex]

3. To combine these fractions, we need a common denominator. The least common multiple of the denominators \(1\), \(2x - 1\), and \(3x(2x - 1)\) is \(3x(2x - 1)\). Rewrite each term with this common denominator:

[tex]\[ \frac{3x(2x - 1)}{3x(2x - 1)} + \frac{3 \cdot 3x}{(2x - 1) \cdot 3x} - \frac{(x - 1)}{3x (2x - 1)} \][/tex]

Simplify each term:

- The first term:
[tex]\[ 1 = \frac{3x(2x - 1)}{3x(2x - 1)} \][/tex]

- The second term:
[tex]\[ \frac{3}{2x - 1} = \frac{3 \cdot 3x}{(2x - 1) \cdot 3x} = \frac{9x}{3x(2x - 1)} \][/tex]

- The third term is already in its simplest form:
[tex]\[ - \frac{x - 1}{3x(2x - 1)} \][/tex]

4. Combine the fractions:

[tex]\[ \frac{3x(2x - 1) + 9x - (x - 1)}{3x(2x - 1)} \][/tex]

5. Simplify the numerator:
[tex]\[ \frac{3x(2x - 1) + 9x - x + 1}{3x(2x - 1)} \][/tex]

Distribute in the first term:
[tex]\[ \frac{6x^2 - 3x + 9x - x + 1}{3x(2x - 1)} \][/tex]

Combine like terms:
[tex]\[ \frac{6x^2 + 5x + 1}{3x(2x - 1)} \][/tex]

Thus, the simplified form of the expression \(1 + \frac{3}{2x - 1} - \frac{x - 1}{6x^2 - 3x}\) is:

[tex]\[ \boxed{\frac{6x^2 + 5x + 1}{3x(2x - 1)}} \][/tex]

Refering to the options given:
[tex]\[\frac{(3 x+1)(2 x-1)}{3 x(2 x+1)}\][/tex]
[tex]\[\frac{(3 x+1)(2 x+1)}{3 x(2 x-1)}\][/tex]
[tex]\[\frac{3 x+1}{3 x}\][/tex]
[tex]\[\frac{2 x+1}{2 x-1}\][/tex]

The exact match is within the options:
[tex]\[ \boxed{\frac{(3 x+1)(2 x+1)}{3 x(2 x-1)}} \][/tex]

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