Adding/subtracting rational expressions?
1. ((x^2+2x)/(12x+54))-((3-x)/(8x+36))
2. ((2)/(x^2+8x+15))+((1)/x^2+11x+30))

Please, these are the last two on my homework I don't understand. Please show work.

Question

Adding/subtracting rational expressions?
1. ((x^2+2x)/(12x+54))-((3-x)/(8x+36)) 
2. ((2)/(x^2+8x+15))+((1)/x^2+11x+30)) 

Please, these are the last two on my homework I don't understand. Please show work.

mathstudent55 · Answer

If you need to add or subtract fractions, so you need a common denominator.

mathstudent55 · Answer

To find a common denominator for rational expressions, first factor the denominators of the rational expressions. Then see which factors you need for the LCD.

isaiah.feynman · Answer

@skltngrl12 what exactly don't you understand?