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I'm kind of stuck on this one: My answer is -b^2 + 1 / 4b^2 - 7b + 3

Guest Mar 18, 2015

Best Answer 

 #1
avatar+17705 
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The common denominator for all the denominators is b(b - 1).

Multiply both the numerator and the denominator by this expression.

Numerator: [ (1/b - 2/(b - 1) ] x (b)(b - 1)  =  1(b - 1) - 2(b)  =  b - 1 - 2b  =  -1 - b

Denominator:  [ 3/b + 1/(b - 1) ] x (b)(b - 1)  =  3(b - 1) + 1(b)  =  3b - 3 + b  =  4b - 3

Answer:  (-1 - b) / (4b - 3) 

geno3141  Mar 18, 2015
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2+0 Answers

 #1
avatar+17705 
+5
Best Answer

The common denominator for all the denominators is b(b - 1).

Multiply both the numerator and the denominator by this expression.

Numerator: [ (1/b - 2/(b - 1) ] x (b)(b - 1)  =  1(b - 1) - 2(b)  =  b - 1 - 2b  =  -1 - b

Denominator:  [ 3/b + 1/(b - 1) ] x (b)(b - 1)  =  3(b - 1) + 1(b)  =  3b - 3 + b  =  4b - 3

Answer:  (-1 - b) / (4b - 3) 

geno3141  Mar 18, 2015
 #2
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Thank you Geno!

Guest Mar 19, 2015

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