Question 868995
you are looking to make both denominators the same.


your denominators are:


your denominators are:


(9 * x^2 * y^7) and (3 * x^4 * y^2 * z)


you have to multiply your first denominator by z and x^2


you have to multiply your second denominator by 3 and y^5


you will get:


( 9 * x^2 * y^7 * z * x^2) and (3 * x^4 * y^2 * z * 3 * y^5)


since x^2 * x^2 = x^4 in the expression on the left, and 3 * 3 = 9 and y^2 * y^5 = y^7 in the expression on the right, you will get:


( 9 * x^4 * y^7 * z) and (9 * x^4 * y^7 * z)


now the denominators are the same.


This is the LCD because there is no smaller denominator that you can find that is common to both.