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8th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions and Identities

  • question_answer
    Given that \[pq=6\]and \[p+q=5,\]find the value of \[{{p}^{2}}+{{q}^{2}}\].

    A)  \[300\]                

    B)  \[37\]                  

    C)         \[13\]                                  

    D)         \[12\]

    Correct Answer: C

    Solution :

    \[{{p}^{2}}+{{q}^{2}}={{(p+q)}^{2}}-2pq\] \[={{5}^{2}}-2(6)=25-12=13\]


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