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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    The value of \[25{{x}^{2}}+16{{y}^{2}}+40xy\] at \[5{{x}^{3}}-7x-6=0.\]and\[y=-\,1\]is

    A) 81                               

    B)  \[-\] 49

    C) 1                    

    D) None of these

    Correct Answer: C

    Solution :

    \[12x+11y=57,\] At \[x=1\] and  \[\frac{2}{x}+3y=15\] \[12x+11y=57,\]        


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