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7th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    The value of \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-ab+bc-ac+a\]for\[a=1,b=2\] and \[c=-1\] is

    A) 2                                 

    B) 4

    C) 7                                 

    D) 5

    Correct Answer: B

    Solution :

     \[{{(1)}^{2}}+{{(2)}^{2}}+{{(-1)}^{2}}-(1)\,(2)+(2)(-1)-(1)\,(-1)+1\] \[=1+4+1-2-2+1+1\] \[=8-4=4\]


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