Qué condición debe cumplirse antes de poder sumar y restar fracciones

es urgente !!!

The terms must have a common denominator

Step-by-step explanation:

To be able to add or subtract fractions, the denominators have to be the same. This is because, when adding or subtracting fractions, only the numerators are changed, but the denominators stay the same. Therefore, if the denominators are different, the "answer" would be wrong.

El numero de abajo tiene que ser el mismo en los dos:

Si no, tienes que cambiarlos para que si lo sean:

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1