Math Problem Statement

Decide whether the Intermediate Value Theorem applies to the given function on the indicated interval. If so, find c as guaranteed by the theorem.

Solution

The problem asks to determine whether the Intermediate Value Theorem (IVT) applies to the given function on the interval [0,6][0,6] and whether f(c)=2f(c) = 2 has a solution in that interval.

Step-by-step breakdown:

  1. Given Function: f(x)=x2+x+22f(x) = -x^2 + x + 22 The function is a polynomial, which is continuous everywhere, including the interval [0,6][0,6]. Therefore, the continuity condition of the IVT is satisfied.

  2. Interval and values: We need to check if f(0)f(0) and f(6)f(6) bracket the value 2.

    • Calculate f(0)f(0): f(0)=(0)2+0+22=22f(0) = -(0)^2 + 0 + 22 = 22
    • Calculate f(6)f(6): f(6)=(6)2+6+22=36+6+22=8f(6) = -(6)^2 + 6 + 22 = -36 + 6 + 22 = -8

    So, f(0)=22f(0) = 22 and f(6)=8f(6) = -8.

  3. IVT condition: The IVT guarantees that for any value LL between f(0)=22f(0) = 22 and f(6)=8f(6) = -8, there exists a c(0,6)c \in (0,6) such that f(c)=Lf(c) = L.

    Since 22 is between 2222 and 8-8, there must be some c(0,6)c \in (0,6) such that f(c)=2f(c) = 2.

  4. Finding cc where f(c)=2f(c) = 2: We need to solve the equation f(x)=2f(x) = 2:

    x2+x+22=2-x^2 + x + 22 = 2 Simplifying this: x2+x+222=0-x^2 + x + 22 - 2 = 0 x2+x+20=0-x^2 + x + 20 = 0 Multiplying through by 1-1: x2x20=0x^2 - x - 20 = 0 Solving this quadratic equation using the quadratic formula: x=(1)±(1)24(1)(20)2(1)x = \frac{-(-1) \pm \sqrt{(-1)^2 - 4(1)(-20)}}{2(1)} x=1±1+802x = \frac{1 \pm \sqrt{1 + 80}}{2} x=1±812x = \frac{1 \pm \sqrt{81}}{2} x=1±92x = \frac{1 \pm 9}{2} So: x=1+92=5orx=192=4x = \frac{1 + 9}{2} = 5 \quad \text{or} \quad x = \frac{1 - 9}{2} = -4 Since x=4x = -4 is outside the interval [0,6][0,6], the valid solution is x=5x = 5.

Conclusion:

The IVT applies, and the value of cc where f(c)=2f(c) = 2 is c=5c = 5.

The correct answer is: Yes, the Intermediate Value Theorem applies and c=5.\boxed{\text{Yes, the Intermediate Value Theorem applies and } c = 5.}

Would you like any more details on this explanation or another concept? Here are some related questions to explore:

  1. Why is the Intermediate Value Theorem important in calculus?
  2. How can we generalize the application of the IVT to other types of functions?
  3. What happens if a function is not continuous on the interval?
  4. Can the IVT be applied if f(0)f(0) and f(6)f(6) don't bracket the target value?
  5. How does solving a quadratic equation differ if its discriminant is negative?

Tip: When applying the IVT, always ensure the function is continuous over the interval you're considering.

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Math Problem Analysis

Mathematical Concepts

Calculus
Intermediate Value Theorem
Polynomials
Quadratic Equations

Formulas

f(x) = -x^2 + x + 22
Quadratic equation: ax^2 + bx + c = 0
Quadratic formula: x = [-b ± sqrt(b^2 - 4ac)] / 2a

Theorems

Intermediate Value Theorem

Suitable Grade Level

Grade 12 / College Calculus