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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    The given algebraic expression of its exponent in ascending order is \[x-{{x}^{8}}+{{x}^{2}}-1.7{{x}^{10}}+1.4{{x}^{8}}-7.8{{x}^{2}}+4-9x\]

    A)  \[4-8x-6.8{{x}^{2}}+0.4{{x}^{8}}-1.7{{x}^{10}}\]

    B)  \[-1.7{{x}^{10}}+0.4{{x}^{8}}-6.8{{x}^{2}}-8x+4\]

    C)  \[4-6.8x-8{{x}^{2}}+0.4{{x}^{8}}-1.7{{x}^{10}}\]

    D)  \[-1.7{{x}^{10}}-0.4{{x}^{8}}-6.8{{x}^{2}}+8x+4\]

    Correct Answer: A

    Solution :

    \[x-{{x}^{8}}+{{x}^{2}}-1.7{{x}^{10}}+1.4{{x}^{8}}-7.8{{x}^{2}}+4-9x\] \[=4+(x-9x)+({{x}^{2}}-7.8{{x}^{2}})+(-{{x}^{8}}+1.4{{x}^{8}})-1.7{{x}^{10}}\]\[=4-8x-6.8{{x}^{2}}+0.4{{x}^{8}}-1.7{{x}^{10}}\]


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