Math Problem Statement

If the slope of the parabola is y = ax^2+bx+c where a, b, c ∈ R{0} at the points (3,2) and (2,3) are 34 and 12 respectively, then find the value of a.

Solution

We are given a quadratic equation y=ax2+bx+cy = ax^2 + bx + c, and the slopes at the points (3,2)(3,2) and (2,3)(2,3) are given as 34 and 12, respectively.

Step 1: Derivative of the parabola (Slope equation)

The slope of the parabola at any point is given by the derivative of yy with respect to xx:

dydx=2ax+b\frac{dy}{dx} = 2ax + b

Step 2: Using the slope conditions

We are given that at the point (3,2)(3, 2), the slope is 34, and at (2,3)(2, 3), the slope is 12. So, we can set up two equations based on these conditions:

  1. For x=3x = 3, the slope is 34: 2a(3)+b=342a(3) + b = 34 Simplifying: 6a+b=34(Equation 1)6a + b = 34 \quad \text{(Equation 1)}

  2. For x=2x = 2, the slope is 12: 2a(2)+b=122a(2) + b = 12 Simplifying: 4a+b=12(Equation 2)4a + b = 12 \quad \text{(Equation 2)}

Step 3: Solving the system of equations

Now we have the system of equations: 6a+b=34(Equation 1)6a + b = 34 \quad \text{(Equation 1)} 4a+b=12(Equation 2)4a + b = 12 \quad \text{(Equation 2)}

We subtract Equation 2 from Equation 1 to eliminate bb:

(6a+b)(4a+b)=3412(6a + b) - (4a + b) = 34 - 12 2a=222a = 22 a=11a = 11

Thus, the value of aa is 11\boxed{11}.

Would you like further clarification or more details on any step?


Here are 5 related questions for further practice:

  1. Find the value of bb after finding a=11a = 11.
  2. Determine the equation of the parabola by finding cc as well.
  3. What is the general formula for the slope of a quadratic function at any point xx?
  4. How would the slopes change if the quadratic had no linear term, i.e., b=0b = 0?
  5. If the parabola passes through the origin, what would be the value of cc?

Tip: When given the slope of a curve at specific points, always consider taking the derivative to create equations involving the given information.

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Math Problem Analysis

Mathematical Concepts

Calculus
Algebra
Derivatives
Quadratic Equations

Formulas

Derivative of a quadratic equation: dy/dx = 2ax + b

Theorems

Differentiation rules for polynomials

Suitable Grade Level

Grades 10-12