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8. A cubic function with a leading coefficient of -2, with one positive zero.

User Dolcalmi
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Answer:

Example: - 2x³ + 10x²

Explanation:

1.A cubic function is a polynomial of degree 3 in one variable. This means that the highest exponent of the variable is 3:

2. Leading coefficient is the coefficient of the term with the highest exponent: in ax³ the leading coefficient is a.

3. General form of a cubic function: ax³ + bx² + cx + d, where a ≠ 0

4. Zeros of a polynomial function are the values of x for which the polynomial values zero: ax³ + bx² + cx + d = 0

5. When the polinomial is factored you can tell easily which the zeros are.

This is how a factored cubic function looks: a(x - x₁)(x - x₂)(x - x₃), where a is the leading coefficient, and x₁, x₂, and x₃ are the three zeroes of the function.

With that, you can write a cubic function with the restrictions stated:

  • leading coefficien of - 2: a = - 2
  • one positive zero: x₁ = 5
  • for facility, make the other zeros equal to zero, x₂ = 0, and x₃ = 0
  • name the function f(x)

result: f(x) = - 2( x -5)(x - 0)(x -0) = -2(x - 5)(x)(x)

  • Expand the expression using distributive property:

- 2x³ + 10x²

User Druuu
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