10th Class Mathematics Related to Competitive Exam Question Bank Algebra

  • question_answer
    The L.C.M. of \[xy+yz+zx+{{y}^{2}}\] and \[{{x}^{2}}+xy+yz+zx\] is

    A)  \[x+y\]               

    B)        \[y+z\]

    C) \[(x+y)(y+z)(z+x)\]          

    D) \[{{x}^{2}}+{{y}^{2}}\]

    Correct Answer: C

    Solution :

    \[xy+yz+zx+{{y}^{2}}=(xy+{{y}^{2}})(yz+zx)\]                                     \[=y(x+y)+z(y+x)\]                                     \[=(x+y)(y+z)\] and        \[{{x}^{2}}+xy+yz+zx=x(x+y)+z(y+x)\]                 \[=(x+y)(x+z)=(x+y)(z+x)\] \[\therefore \]  \[L.C.M.=(x+y)(y+z)(z+x)\]


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