Question

How to add/subtract with polynomial denominators?

He gave us the answer but I don’t know how to solve
:\

Answer 1

Explanation:

• Cross multiply the numerators by the denominators.

`(5n)/(n-2) -(5)/(n-1) =(5n(n-1)-5(n-2))/((n-2)(n-1))`

• Foil out the numerator:

`(5n)/(n-2) -(5)/(n-1) =(5n(n-1)-5(n-2))/((n-2)(n-1))=(5n^(2)-5n-5n+10 )/((n-2)(n-1))`

• Simplify!