# Adding and Subtracting rational expressions

**Question description**

Rewrite the fractions with their LCD (lowest common denominator)

__1 and 6__3x – 9y 5x – 15y

Simplify

__n__-__2__2 – n n – 2

Simplify

__10__+__3__3b + 5 7b – 2

Simplify

__10__-__1__x² - 16 x + 4

Simplify

__2y__-__1__y² - 9y + 20 y - 4

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