9th Class Mathematics Polynomials Question Bank Polynomials

  • question_answer
    The product\[(a+b)(a-b)({{a}^{2}}-ab+{{b}^{2}})\]\[({{a}^{2}}+ab+{{b}^{2}})\] is equal to ___.

    A)  \[{{a}^{6}}+{{b}^{6}}\]

    B)  \[{{a}^{6}}-{{b}^{6}}\]

    C)  \[{{a}^{3}}-{{b}^{3}}\]

    D)  \[{{a}^{3}}+{{b}^{3}}\]

    Correct Answer: B

    Solution :

    We have, \[(a+b)(a-b)({{a}^{2}}-ab+{{b}^{2}})({{a}^{2}}+ab+{{b}^{2}})\] \[=(a+b)({{a}^{2}}-ab+{{b}^{2}})(a-b)({{a}^{2}}+ab+{{b}^{2}})\] \[=({{a}^{3}}+{{b}^{3}})({{a}^{3}}-{{b}^{3}})={{({{a}^{3}})}^{2}}-{{({{b}^{3}})}^{2}}={{a}^{6}}-{{b}^{6}}\]


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