Math Problem Statement

Write a quadratic function f whose zeros are 11 and -2.

Solution

The problem is asking to write a quadratic function f(x)f(x) whose zeros are 11 and -2.

To construct a quadratic function from its zeros (roots), we use the fact that if a quadratic equation has roots r1r_1 and r2r_2, the corresponding quadratic function can be written as:

f(x)=a(xr1)(xr2)f(x) = a(x - r_1)(x - r_2)

Here, the zeros are r1=11r_1 = 11 and r2=2r_2 = -2, so the function becomes:

f(x)=a(x11)(x+2)f(x) = a(x - 11)(x + 2)

Now, we'll expand the expression:

f(x)=a[(x11)(x+2)]f(x) = a \left[(x - 11)(x + 2)\right] f(x)=a(x2+2x11x22)f(x) = a(x^2 + 2x - 11x - 22) f(x)=a(x29x22)f(x) = a(x^2 - 9x - 22)

If no value for aa is given, we assume a=1a = 1, so the quadratic function becomes:

f(x)=x29x22f(x) = x^2 - 9x - 22

Thus, the quadratic function is:

f(x)=x29x22f(x) = x^2 - 9x - 22

Would you like any additional details or clarifications on this?

Here are five related questions for further understanding:

  1. How do you determine the equation of a quadratic function from given roots?
  2. What is the significance of the coefficient aa in the general form of a quadratic equation?
  3. Can a quadratic function have more than two zeros?
  4. How do you factor a quadratic equation to find its roots?
  5. What role does the discriminant play in determining the nature of the roots of a quadratic equation?

Tip: Always check the sign of the zeros when constructing a quadratic function to avoid errors.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Zeros of a Function

Formulas

Quadratic equation: f(x) = a(x - r_1)(x - r_2)
Expanded form: f(x) = ax^2 + bx + c

Theorems

The relationship between the roots and the factors of a quadratic equation
Factoring quadratic expressions

Suitable Grade Level

Grades 9-11