Factorizing the Numerators and Denominators

Oct 13, 2025 by wbrum.org 2 views

===========================================================

Introduction

Simplifying complex rational expressions is a crucial skill in mathematics, particularly in algebra and calculus. It involves breaking down complex expressions into simpler ones, making it easier to solve equations and inequalities. In this article, we will explore the process of simplifying the given rational expression: $\frac{y^2+14y+45}{y^2+3y-4} \cdot \frac{y^2+2y-3}{y^2+18y+81} = \square$ . We will break down the expression into manageable parts, simplify each part, and then combine them to obtain the final simplified expression.

Factorizing the Numerators and Denominators

The first step in simplifying the given rational expression is to factorize the numerators and denominators. This involves expressing each expression as a product of its factors.

Factorizing the Numerators

The numerator of the first fraction is $y^2+14y+45$ . We can factorize this expression as $(y+3)(y+15)$ .
The numerator of the second fraction is $y^2+2y-3$ . We can factorize this expression as $(y+3)(y-1)$ .

Factorizing the Denominators

The denominator of the first fraction is $y^2+3y-4$ . We can factorize this expression as $(y+4)(y-1)$ .
The denominator of the second fraction is $y^2+18y+81$ . We can factorize this expression as $(y+9)(y+9)$ .

Canceling Common Factors

Now that we have factorized the numerators and denominators, we can cancel out common factors between the numerators and denominators.

Canceling Common Factors in the First Fraction

The numerator of the first fraction is $(y+3)(y+15)$ .
The denominator of the first fraction is $(y+4)(y-1)$ .
We can cancel out the common factor $(y+3)$ between the numerator and denominator.

Canceling Common Factors in the Second Fraction

The numerator of the second fraction is $(y+3)(y-1)$ .
The denominator of the second fraction is $(y+9)(y+9)$ .
We can cancel out the common factor $(y-1)$ between the numerator and denominator.

Simplifying the Expression

Now that we have canceled out common factors, we can simplify the expression by multiplying the remaining factors.

Simplifying the First Fraction

The numerator of the first fraction is $(y+15)$ .
The denominator of the first fraction is $(y+4)(y-1)$ .
We can simplify the first fraction as $\frac{y+15}{(y+4)(y-1)}$ .

Simplifying the Second Fraction

The numerator of the second fraction is $(y+3)$ .
The denominator of the second fraction is $(y+9)(y+9)$ .
We can simplify the second fraction as $\frac{y+3}{(y+9)^2}$ .

Combining the Simplified Fractions

Now that we have simplified each fraction, we can combine them to obtain the final simplified expression.

Combining the Simplified Fractions

The simplified first fraction is $\frac{y+15}{(y+4)(y-1)}$ .
The simplified second fraction is $\frac{y+3}{(y+9)^2}$ .
We can combine the simplified fractions as $\frac{(y+15)(y+3)}{(y+4)(y-1)(y+9)^2}$ .

Conclusion

In this article, we have simplified the given rational expression: $\frac{y^2+14y+45}{y^2+3y-4} \cdot \frac{y^2+2y-3}{y^2+18y+81} = \square$ . We have broken down the expression into manageable parts, simplified each part, and then combined them to obtain the final simplified expression. The simplified expression is $\frac{(y+15)(y+3)}{(y+4)(y-1)(y+9)^2}$ . This expression is now in its simplest form, making it easier to solve equations and inequalities involving the given rational expression.

Final Answer

The final simplified expression is $\boxed{\frac{(y+15)(y+3)}{(y+4)(y-1)(y+9)^2}}$ .

===========================================================

Introduction

In our previous article, we explored the process of simplifying complex rational expressions. We broke down the expression $\frac{y^2+14y+45}{y^2+3y-4} \cdot \frac{y^2+2y-3}{y^2+18y+81} = \square$ into manageable parts, simplified each part, and then combined them to obtain the final simplified expression. In this article, we will answer some frequently asked questions about simplifying complex rational expressions.

Q&A

Q: What is the first step in simplifying a complex rational expression?

A: The first step in simplifying a complex rational expression is to factorize the numerators and denominators. This involves expressing each expression as a product of its factors.

Q: How do I factorize a quadratic expression?

A: To factorize a quadratic expression, you need to find two numbers whose product is the constant term and whose sum is the coefficient of the linear term. For example, to factorize the quadratic expression $y^2+14y+45$ , you need to find two numbers whose product is 45 and whose sum is 14. The two numbers are 15 and 3, so the quadratic expression can be factorized as $(y+15)(y+3)$ .

Q: What is the next step after factorizing the numerators and denominators?

A: After factorizing the numerators and denominators, you need to cancel out common factors between the numerators and denominators. This involves dividing out any common factors between the numerator and denominator.

Q: How do I cancel out common factors?

A: To cancel out common factors, you need to identify any common factors between the numerator and denominator. For example, if the numerator is $(y+15)(y+3)$ and the denominator is $(y+4)(y-1)$ , you can cancel out the common factor $(y+3)$ between the numerator and denominator.

Q: What is the final step in simplifying a complex rational expression?

A: The final step in simplifying a complex rational expression is to combine the simplified fractions. This involves multiplying the remaining factors together to obtain the final simplified expression.

Q: How do I combine simplified fractions?

A: To combine simplified fractions, you need to multiply the numerators together and multiply the denominators together. For example, if the simplified first fraction is $\frac{y+15}{(y+4)(y-1)}$ and the simplified second fraction is $\frac{y+3}{(y+9)^2}$ , you can combine them as $\frac{(y+15)(y+3)}{(y+4)(y-1)(y+9)^2}$ .

Common Mistakes to Avoid

When simplifying complex rational expressions, there are several common mistakes to avoid. These include:

Not factorizing the numerators and denominators
Not canceling out common factors
Not combining the simplified fractions correctly
Not checking for any remaining common factors

Tips and Tricks

Here are some tips and tricks to help you simplify complex rational expressions:

Always factorize the numerators and denominators before simplifying the expression.
Cancel out common factors between the numerator and denominator.
Combine the simplified fractions by multiplying the numerators together and multiplying the denominators together.
Check for any remaining common factors after combining the simplified fractions.

Conclusion

Simplifying complex rational expressions can be a challenging task, but with practice and patience, you can master the process. By following the steps outlined in this article, you can simplify even the most complex rational expressions. Remember to factorize the numerators and denominators, cancel out common factors, and combine the simplified fractions to obtain the final simplified expression.

Final Answer

The final simplified expression is $\boxed{\frac{(y+15)(y+3)}{(y+4)(y-1)(y+9)^2}}$ .