Complete the corresponding expression for the denominator
Complete the corresponding expression for the denominator
Let's examine the problem, first we'll write down the expression on the right side as a fraction (using the fact that dividing a number by 1 doesn't change its value):
Now let's think logically, and remember the fraction reduction operation,
For the fraction on the left side to be reducible, we want all the terms in its denominator to have a common factor, additionally, we want to reduce the number 19 to get the number 1 and also reduce the term from the fraction's numerator since in the expression on the right side it doesn't appear, therefore we'll choose the expression:
Let's verify that with this choice we indeed get the expression on the right side:
therefore this choice is indeed correct.
In other words - the correct answer is answer D.