A rational expression is a fraction where both the numerator and denominator are polynomials. In simpler terms, it is an expression written as a ratio of two polynomials. In this article, we will cover the basics of multiplying and dividing rational expressions.
The process of multiplying rational expressions is similar to multiplying regular fractions. We can follow these steps to find the solution:
For example, let's consider the rational expression 8x²+4/16x and 3y/y. We can cancel out 4 in the numerator and denominator, giving us 2x²/4x. Simplifying this further, we get x/2 as the solution.
The division of rational expressions follows a similar concept as multiplication. Let's take a look at the steps:
For instance, if we have 2x/4 divided by 1/3, we can invert 1/3 to get 3/1 and follow the steps for multiplication. This gives us 6x as the solution.
Let's see how we can use these steps to solve some examples:
(2x+4)/(x²+3x+2) x (x²+2x+1)/(8x+16)
First, we can factorize the first rational expression to (2x+4)/(x+2)(x+1) and the second one to (x+1)/(8(x+2)). By cancelling out the common factor (x+1) in both expressions, we get 2/(8x+16). This can be further simplified to 1/4x+4.
(3x+9)/(x²+3x+2) ÷ (x²+3x+2)/(6x+12)
Here, we invert the second rational expression to get (6x+12)/(x²+3x+2). Simplifying the first expression to (3x+9)/(x+1)(x+2), we can cancel out common factors and get 3/(1)(x+2), which can be simplified to 3/(x+2). Following the steps for multiplication, we get 6/(6x+12) and simplifying it gives us 1/(x+2) as the solution.