Question 88020
find the LCD for the given rational expression and convert each rationalexpression into an equivalent rational expression with the LCD as the denominator. 
64) 4/x-y, 5x/2y-2x 
Factor where you can:
5/(x-y), 5x/-2(x-y)
LCD = -2(x-y)
Rewrite each expression with the LCD as its denominator:
4(-2)/LCD , 5x/LCD
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70) 3/4b^2-9,2b/2b+3,-5/2b^2-3b 
Factor where you can
3/[(2b-3)(2b+3)], 2b/(2b+3), -5/[b(2b-3)]
LCD = b(2b+3)(2b-3)
Rewrite each expression with the LCD as it denominator:
3b/LCD, 2b(b)(2b-3)/LCD, -5(2b+3)/LCD
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69) -5/6x-12,x/x^2-4,3/2x+4 
Factor the denominators.
Select the LCD
Rewrite each expression with the LCD as its denominator.
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Cheers,
Stan H.