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

  • question_answer
    The sum of two expressions is \[{{x}^{3}}-{{x}^{2}}+3x-2\]If one of them is \[{{x}^{2}}+5x-6.\]what is the other?

    A)  \[{{x}^{3}}-2{{x}^{2}}-2x-4\]

    B)  \[{{x}^{3}}+3{{x}^{2}}-2x+4\]

    C)  \[{{x}^{3}}-2{{x}^{2}}-2x+4\]

    D)                  \[-{{x}^{3}}-2{{x}^{2}}+2x-4\]

    Correct Answer: C

    Solution :

    \[\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\underset{{{x}^{3}}\,\,\,\,-\,\,\,2{{x}^{2}}\,\,\,-2x\,\,\,+\,\,4}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\begin{align}   & {{x}^{3}}-{{x}^{2}}+3x-2 \\  & (-){{x}^{2}}+5x-6 \\  & -\,\,\,\,\,\,\,\,\,-\,\,\,\,\,\,\,\,\,\,+\,\,\,\,\,\,\,\,\,- \\ \end{align}}}\,}}\,}}\,\]


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