Question

subtract 2/49z^3y - 1/14z^2y

Answer 1

find the common factor?

Answer 2

Use as a common denominator:
\[(49\times14)z ^{3}y\]
Then combining the two terms of the question:
\[(14-49z)\div((49\times14)z ^{3}y)=(2-7z)\div(98z ^{3}y)\]

Answer 3

2 1 2*2 - 1*7 4 - 7 -3
------- - -------- = ----------- = -------- = --------
49z^3y 14z^2y 98z^3y 98z^3y 98z^3y