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NDA2021MathematicsDifferentiationActual

If y= x 4 x 8 x , then what is 1 y d y d x at x= 4 equal to?

Options

  1. A-1
  2. B0
  3. C1
  4. D3

Correct answer

A. -1

Step-by-step solution

aligned & y= x 4 x 8 x & y= ( x)+ ( 4 x)+ ( 8 x) & 1 y d y d x =- x-4 4 x-8 8 x aligned Put x= 4 1 y d y d x =-1-4(0)-8(0)-1

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