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3. Simplify the expression [tex]\(\left(6 x^2-13 x+6\right)\)[/tex] divided by [tex]\((2 x-3)\)[/tex].

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

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

C. [tex]\(3 x\)[/tex]

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

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

Sagot :

To solve the division of the polynomial [tex]\( 6x^2 - 13x + 6 \)[/tex] by [tex]\( 2x - 3 \)[/tex], we perform polynomial long division. Here's a detailed, step-by-step solution:

1. Setup the Division: Write the dividend and divisor.
[tex]\[ \frac{6x^2 - 13x + 6}{2x - 3} \][/tex]

2. First Division Step: Divide the leading term of the numerator by the leading term of the denominator:
[tex]\[ \frac{6x^2}{2x} = 3x \][/tex]

3. Multiply and Subtract: Multiply [tex]\( 3x \)[/tex] by [tex]\( 2x - 3 \)[/tex] and subtract the result from the original polynomial.
[tex]\[ (3x) \cdot (2x - 3) = 6x^2 - 9x \][/tex]
[tex]\[ 6x^2 - 13x + 6 - (6x^2 - 9x) = -13x + 9x + 6 = -4x + 6 \][/tex]

4. Second Division Step: Divide the leading term of the new polynomial by the leading term of the divisor:
[tex]\[ \frac{-4x}{2x} = -2 \][/tex]

5. Multiply and Subtract: Multiply [tex]\( -2 \)[/tex] by [tex]\( 2x - 3 \)[/tex] and subtract the result from the current polynomial.
[tex]\[ (-2) \cdot (2x - 3) = -4x + 6 \][/tex]
[tex]\[ -4x + 6 - (-4x + 6) = 0 \][/tex]

Since the remainder is [tex]\( 0 \)[/tex], the division is exact.

The quotient is:

[tex]\[ 3x - 2 \][/tex]

So, the correct answer is:

[tex]\[ \boxed{B) \ 3x - 2} \][/tex]
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