Previously, we learned about restrictions and simplifying a single rational expression.
\(\dfrac{4x^3y}{16x^2y^4}\)
\(=\dfrac{4\times x\times x\times x\times y}{4\times 4\times x\times x\times y\times y\times y\times y},~ x \ne 0,~ y \ne 0\)
\(=\dfrac{4}{4}\times \dfrac{\cancel{x}}{\cancel{x}}\times \dfrac{\cancel{x}}{\cancel{x}}\times \dfrac{\cancel{y}}{\cancel{y}}\times \dfrac{x}{4\times y\times y\times y}\)
\(=1\times 1\times 1\times 1\times \dfrac{x}{4y^3}\)
Now we will start multiplying and dividing rational expressions.