Math Problem Statement

Find the derivative of y with respect to x if y equals left parenthesis 3 x squared minus 6 x plus 6 right parenthesis e Superscript negative 5 x.

Solution

We are tasked with finding the derivative of:

y=(3x26x+6)e5xy = (3x^2 - 6x + 6)e^{-5x}

This is a product of two functions: u(x)=3x26x+6u(x) = 3x^2 - 6x + 6 and v(x)=e5xv(x) = e^{-5x}. To differentiate this, we will apply the product rule:

ddx[u(x)v(x)]=u(x)v(x)+u(x)v(x)\frac{d}{dx}[u(x)v(x)] = u'(x)v(x) + u(x)v'(x)

Step 1: Differentiate u(x)u(x)

u(x)=3x26x+6u(x) = 3x^2 - 6x + 6 u(x)=ddx(3x26x+6)=6x6u'(x) = \frac{d}{dx}(3x^2 - 6x + 6) = 6x - 6

Step 2: Differentiate v(x)v(x)

v(x)=e5xv(x) = e^{-5x} v(x)=ddx(e5x)=5e5xv'(x) = \frac{d}{dx}(e^{-5x}) = -5e^{-5x}

Step 3: Apply the product rule

Now, applying the product rule:

dydx=u(x)v(x)+u(x)v(x)\frac{dy}{dx} = u'(x)v(x) + u(x)v'(x)

Substituting the derivatives:

dydx=(6x6)e5x+(3x26x+6)(5e5x)\frac{dy}{dx} = (6x - 6)e^{-5x} + (3x^2 - 6x + 6)(-5e^{-5x})

Step 4: Simplify the expression

Factor out e5xe^{-5x}:

dydx=e5x[(6x6)+(5)(3x26x+6)]\frac{dy}{dx} = e^{-5x} \left[ (6x - 6) + (-5)(3x^2 - 6x + 6) \right]

Expand the second term:

=e5x[6x615x2+30x30]= e^{-5x} \left[ 6x - 6 - 15x^2 + 30x - 30 \right]

Combine like terms:

=e5x[15x2+36x36]= e^{-5x} \left[ -15x^2 + 36x - 36 \right]

Thus, the derivative is:

dydx=e5x(15x2+36x36)\frac{dy}{dx} = e^{-5x}(-15x^2 + 36x - 36)

Let me know if you need further details or have any questions!


Here are 5 related questions:

  1. How does the product rule apply to other exponential functions?
  2. What is the significance of negative exponents in derivatives?
  3. How do you factor a quadratic function like 15x2+36x36-15x^2 + 36x - 36?
  4. How can you check if the derivative is correct using limits?
  5. What are some real-world applications of exponential derivatives?

Tip: When using the product rule, always differentiate each function separately before combining them!

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Math Problem Analysis

Mathematical Concepts

Calculus
Differentiation
Product Rule
Exponential Functions

Formulas

Product Rule: d/dx [u(x)v(x)] = u'(x)v(x) + u(x)v'(x)
Derivative of e^kx: d/dx[e^kx] = ke^kx

Theorems

Product Rule

Suitable Grade Level

Grades 11-12 or College Calculus