Hello, I am trying to understand an example problem with a step by step solution. However, I am stuck on how one of the steps was achieved and there is no explanation.

I need to add the fractions:

X2?+X35?

Can someone explain to the logic behind "if we multiple the top and bottom o the first fraction by X^2". How did that fraction come about?

2 5 xx3 In the denominator of the first fraction, use the fact that x = x'. 2 5 3*? If we multiply the top and bottom of the first fraction by x2, we'll find that we can use x3 as the common denominator. 2x2 5 3;? 203) 5 x'(x2) x3