SOLUTION: find the LCD for the following rational expressions 7/3x and -10/x^2 a. 3x b. 3x^3 c. 3x^2 d. x i thought it was x because by looking at them thats the only thing they have

Question 89983: find the LCD for the following rational expressions 7/3x and -10/x^2
a. 3x
b. 3x^3
c. 3x^2
d. x
i thought it was x because by looking at them thats the only thing they have in common but then i was talking to my sister and she said you have to multiple the equation first and then decide which gave me -70/3x^3 and 3x^3 is one of my choices.
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
7/3X & -10/X^2 HAVE 3&X & X&X AS FACTORS. NOW WE NEED TO MULTIPLY ALL COMMON & ALL UNIQUE FACTORS. THE COMMON FACTOR IS X & THE UNIQUE FACTORS ARE 3 & X. THUS WE HAVE 3*X*X OR 3X^2 WHICH IS THE LOWEST COMMON FACTOR.
ANSWER C).
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