Mathematics
Grade10
Easy

Question

If fraction numerator 9 x squared over denominator 3 x plus 1 end fraction is equivalent to fraction numerator 1 over denominator 3 x plus 1 end fraction plus B for all x, which of the following is equivalent to B?

  1. 3x - 1
  2. 3x + 1
  3. 9x2
  4. 9x2 - 1

hintHint:

In the given question fraction numerator 9 x squared over denominator 3 x plus 1 end fraction is equivalent to fraction numerator 1 over denominator 3 x plus 1 end fraction plus B , we have to find B. For this we can equate both as both are equal and get the value of B.

The correct answer is: 3x - 1


    Given,
    fraction numerator 9 x squared over denominator 3 x plus 1 end fraction equals fraction numerator 1 over denominator 3 x plus 1 end fraction plus B
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell not stretchy rightwards double arrow B equals fraction numerator 9 x squared over denominator 3 x plus 1 end fraction minus fraction numerator 1 over denominator 3 x plus 1 end fraction equals fraction numerator open parentheses 9 x squared minus 1 close parentheses over denominator 3 x plus 1 end fraction equals fraction numerator left parenthesis 3 x minus 1 right parenthesis left parenthesis 3 x plus 1 right parenthesis over denominator left parenthesis 3 x plus 1 right parenthesis end fraction end cell row cell equals 3 x minus 1 end cell end table

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