Respuesta :

Answer:

not really sure but maybe: 0=(x-3)(x+1)(x+7) and then simplify it?

Step-by-step explanation:

y=(x-3)(x+1)(x+7)

 =x^3+5x^2-17x-21

Space

Answer:

f(x) = x³ + 5x² - 17x - 21

General Formulas and Concepts:

Algebra I

  • Standard Form: f(x) = axⁿ + bxⁿ⁻¹ + cx + d
  • Roots of a Polynomial: (x + a)(x + b)(x + c)(x + ...)
  • Expanding by FOIL-ing
  • Combining Like Terms

Step-by-step explanation:

Step 1: Define

Roots x = -7, -1, 3

Step 2: Find function

  1. Write binomial roots:                    f(x) = (x - 3)(x + 1)(x + 7)
  2. Expand:                                         f(x) = (x² + x - 3x - 3)(x + 7)
  3. Combine like terms(x):                 f(x) = (x² - 2x - 3)(x + 7)
  4. Expand:                                         f(x) = x³ - 2x² - 3x + 7x² - 14x - 21
  5. Combine like terms(x²):                f(x) = x³ + 5x² - 3x - 14x - 21
  6. Combine like terms(x):                 f(x) = x³ + 5x² - 17x - 21

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