Math Problem Statement

Let h(x) = f(2x)(g(x))^2 where f(x) is a function such that f(1) = 3 and the graph of f'(x) is given. Using this information, determine h'(1), giving full details of how you have found your answer.

Solution

Let's break down the problem and find the derivative h(1)h'(1) given the function h(x)=f(2x)(g(x))2h(x) = f(2x)(g(x))^2.

Step 1: Differentiate h(x)h(x)

The function h(x)h(x) is defined as: h(x)=f(2x)(g(x))2h(x) = f(2x)(g(x))^2 To find h(x)h'(x), we'll use the product rule, which states that if h(x)=u(x)v(x)h(x) = u(x) \cdot v(x), then: h(x)=u(x)v(x)+u(x)v(x)h'(x) = u'(x)v(x) + u(x)v'(x) Here, let:

  • u(x)=f(2x)u(x) = f(2x)
  • v(x)=(g(x))2v(x) = (g(x))^2

So, h(x)=u(x)v(x)h(x) = u(x) \cdot v(x).

Differentiate u(x)=f(2x)u(x) = f(2x)

Using the chain rule: u(x)=ddxf(2x)=f(2x)2u'(x) = \frac{d}{dx}f(2x) = f'(2x) \cdot 2

Differentiate v(x)=(g(x))2v(x) = (g(x))^2

Using the chain rule and the power rule: v(x)=2g(x)g(x)v'(x) = 2g(x) \cdot g'(x)

Step 2: Combine using the product rule

Now, substitute the derivatives into the product rule: h(x)=u(x)v(x)+u(x)v(x)h'(x) = u'(x)v(x) + u(x)v'(x) h(x)=2f(2x)(g(x))2+f(2x)2g(x)g(x)h'(x) = 2f'(2x) \cdot (g(x))^2 + f(2x) \cdot 2g(x)g'(x) h(x)=2f(2x)(g(x))2+2f(2x)g(x)g(x)h'(x) = 2f'(2x)(g(x))^2 + 2f(2x)g(x)g'(x)

Step 3: Evaluate at x=1x = 1

We need to find h(1)h'(1): h(1)=2f(21)(g(1))2+2f(21)g(1)g(1)h'(1) = 2f'(2 \cdot 1) \cdot (g(1))^2 + 2f(2 \cdot 1) \cdot g(1) \cdot g'(1) This simplifies to: h(1)=2f(2)(g(1))2+2f(2)g(1)g(1)h'(1) = 2f'(2) \cdot (g(1))^2 + 2f(2) \cdot g(1) \cdot g'(1)

Step 4: Use the provided values

From the table:

  • g(1)=35g(1) = 35
  • g(1)=2g'(1) = -2

From the graph for f(x)f'(x):

  • f(2)=1f'(2) = -1 (observing the graph at x=2x = 2)

We also know:

  • f(2)=4f(2) = 4 (since f(x)=0f'(x) = 0 for x<2x < 2, and it appears f(1)=3f(1) = 3, so f(2)=3+1(21)=4f(2) = 3 + 1 \cdot (2-1) = 4).

Substitute these values into the equation: h(1)=2(1)(35)2+2435(2)h'(1) = 2(-1) \cdot (35)^2 + 2 \cdot 4 \cdot 35 \cdot (-2) h(1)=21225560h'(1) = -2 \cdot 1225 - 560 h(1)=2450560h'(1) = -2450 - 560 h(1)=3010h'(1) = -3010

Final Answer:

The derivative h(1)h'(1) is 3010-3010.

Would you like more details, or do you have any questions?

Relative Questions:

  1. How would the derivative change if f(x)f(x) had a different initial value?
  2. What if g(x)g(x) was a different function, how would that affect the derivative?
  3. Could the chain rule be applied differently to find h(x)h'(x)?
  4. What are the implications of h(x)h(x) having such a large derivative value at x=1x = 1?
  5. How does the product rule assist in differentiating products of functions?

Tip:

Always check the conditions provided in the problem to ensure you're using the correct values when substituting into derived equations.

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Math Problem Analysis

Mathematical Concepts

Calculus
Derivatives
Chain Rule
Product Rule

Formulas

h(x) = f(2x)(g(x))^2
Product Rule: h'(x) = u'(x)v(x) + u(x)v'(x)
Chain Rule: u'(x) = f'(2x) * 2
Power Rule: v'(x) = 2g(x) * g'(x)

Theorems

Product Rule
Chain Rule
Power Rule

Suitable Grade Level

College Level or Advanced High School Calculus