Adding and subtracting rational expressions C.P.3

Find the least common denominator of the expression

• 18
• 6x
• 3xy
• 6xy

Simplify the expression

• 6x / 20xy
• 3 / 10y
• (6x+1) / (20xy)
• 3 / 20xy

Simplify the expression

• n / 2m 
• n / 3m 
• (m² + 4n²) / 12m
• n / 4m 

Simplify the expression

• (5x + 4y) / 9y
• (6y + 3x) / 3y
• (2y + x) / y
• (6y + 3x) / 9y 

Simplify the expression

• (-17x - 12y) / 15x

• (23x - 4y) / 15x

• (-17x - 4y) / 15x

• (-3x - 4y) / 8x

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Add

 $\frac{2x-3}{4x-7}+\frac{2x-3}{4x-7}$  

•  $\frac{4x-6}{4x-7}\ ,\ x\ne-\frac{7}{4}$  

•  $\frac{4x^2-6x+9}{4x-7}\ ,\ \ x\ne\frac{7}{4}$  

•  $\frac{4x-6}{4x-7\ }\ ,\ x\ne\frac{7}{4}$ 

• An $\frac{4x-6}{8x-14},\ x\ne\frac{14}{8}$  swer 4