If y = sqrt(4x^2 + 1), find dy/dx.

Practice Questions

Q1
If y = sqrt(4x^2 + 1), find dy/dx.
  1. (4x)/(sqrt(4x^2 + 1))
  2. (2x)/(sqrt(4x^2 + 1))
  3. (8x)/(sqrt(4x^2 + 1))
  4. (2)/(sqrt(4x^2 + 1))

Questions & Step-by-Step Solutions

If y = sqrt(4x^2 + 1), find dy/dx.
Correct Answer: 4x / sqrt(4x^2 + 1)
  • Step 1: Identify the function y = sqrt(4x^2 + 1).
  • Step 2: Rewrite the square root as an exponent: y = (4x^2 + 1)^(1/2).
  • Step 3: Use the chain rule to differentiate. The chain rule states that if you have a function of a function, you multiply the derivative of the outer function by the derivative of the inner function.
  • Step 4: Differentiate the outer function (1/2)(4x^2 + 1)^(-1/2) and keep the inner function (4x^2 + 1) the same.
  • Step 5: Now differentiate the inner function 4x^2 + 1, which gives you 8x.
  • Step 6: Combine the results from Step 4 and Step 5: dy/dx = (1/2)(4x^2 + 1)^(-1/2) * 8x.
  • Step 7: Simplify the expression: dy/dx = (4x)/(sqrt(4x^2 + 1)).
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