10th Class Mathematics Related to Competitive Exam Question Bank Algebra

  • question_answer
    The equation \[\frac{(x+2)(x-5)}{(x-3)(x+6)}=\frac{x-2}{x+4}\] has

    A)  3 roots                

    B)  2 roots

    C)  1 root              

    D)         no root

    Correct Answer: C

    Solution :

     The given equation is                 \[\frac{(x+2)(x-5)}{(x+3)(x+6)}=\frac{(x-2)}{(x+4)}\] \[\Rightarrow \]\[(x+4)(x+2)(x-5)-(x-2)(x-3)(x+6)=0\] \[\Rightarrow \]\[({{x}^{3}}+{{x}^{2}}-22x-40)-({{x}^{3}}+{{x}^{2}}-24x+36)=0\] \[\Rightarrow \]\[2x-76=0\]\[i.e.\] \[(x-38)=0\], has only one root.


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