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  5. Applications of Derivatives

12th Class Mathematics Applications of Derivatives Question Bank Case Based (MCQs) - Applications of Derivatives

  • question_answer
    If the height of the plant is 7/2 cm, the number of days it has been exposed to the sunlight is

    A) 2

    B) 3

    C) 4

    D) 1

    Correct Answer: D

    Solution :

    For \[y=\frac{7}{2}\] \[\frac{7}{2}=4x-\frac{1}{2}{{x}^{2}}\] \[\Rightarrow 7=8x-{{x}^{2}}\] \[\Rightarrow {{x}^{2}}-8x+7=0\] \[\Rightarrow (x-7)(x-1)=0\] \[\Rightarrow x=1\]


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