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What is the quotient?

[tex]\[
\frac{2y^2 - 6y - 20}{4y + 12} \div \frac{y^2 + 5y + 6}{3y^2 + 18y + 27}
\][/tex]

A. \(\frac{2}{3(y-5)}\)

B. \(\frac{3(y-5)}{2}\)

C. \(\frac{(y-5)(y+2)^2}{6(y+3)^2}\)

D. [tex]\(\frac{3(y+5)(y-2)}{2(y+2)}\)[/tex]


Sagot :

Alright, let's solve the quotient step-by-step.

The given expression is:
[tex]\[ \frac{2 y^2-6 y-20}{4 y+12} \div \frac{y^2+5 y+6}{3 y^2+18 y+27} \][/tex]

### Step 1: Rewrite the division as a multiplication of the reciprocal

The division of two fractions can be converted to multiplication by taking the reciprocal of the second fraction. So, we rewrite our expression as:
[tex]\[ \frac{2 y^2-6 y-20}{4 y+12} \times \frac{3 y^2+18 y+27}{y^2+5 y+6} \][/tex]

### Step 2: Factorize Numerator and Denominator Expressions

To simplify further, let's factorize the expressions where possible.

1. Factorizing \(2 y^2 - 6 y - 20\):
[tex]\[ 2 y^2 - 6 y - 20 = 2 (y^2 - 3y - 10) = 2 (y-5)(y+2) \][/tex]

2. Factorizing \(4 y + 12\):
[tex]\[ 4 y + 12 = 4(y + 3) \][/tex]

3. Factorizing \(y^2 + 5 y + 6\):
[tex]\[ y^2 + 5 y + 6 = (y+2)(y+3) \][/tex]

4. Factorizing \(3 y^2 + 18 y + 27\):
[tex]\[ 3 y^2 + 18 y + 27 = 3 (y^2 + 6y + 9) = 3 (y+3)^2 \][/tex]

Now, the expression is:
[tex]\[ \frac{2 (y-5)(y+2)}{4 (y+3)} \times \frac{3 (y+3)^2}{(y+2)(y+3)} \][/tex]

### Step 3: Simplify the Expression

Next, we simplify the expression by canceling out common factors in the numerator and the denominator:
[tex]\[ \frac{2 (y-5)(y+2)}{4 (y+3)} \times \frac{3 (y+3)^2}{(y+2)(y+3)} = \frac{2 \cancel{(y-5)(y+2)}}{4 \cancel{(y+3)}} \times \frac{3 \cancel{(y+3)^2}}{\cancel{(y+2)} \cancel{(y+3)}} \][/tex]

After canceling, we have:
[tex]\[ \frac{2 (y-5)}{4} \times \frac{3 (y+3)}{y+3} \][/tex]

Since \(y+3\) cancels out, we get:
[tex]\[ \frac{2 (y-5)}{4} \times 3 = \frac{3}{2} (y-5) \][/tex]

So, the simplified result is:
[tex]\[ \frac{3}{2} (y-5) \][/tex]

### Step 4: Select the Correct Answer

On inspecting the given multiple choices, the expression simplifies to:
[tex]\[ \boxed{\frac{3(y-5)}{2}} \][/tex]
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