Which of these functions has a y-intercept of (0,9) ○ A) ƒ(x) = 9x² + 4x + 2 B) f(x) = 9(x-3) (x + 4) C) f(x) = 4x((x - 9) 2 D) f(x) = x² + 5x + 9

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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### Question:
Which of these functions has a y-intercept of (0,9)?

### Options:
- **A) \( f(x) = 9x^2 + 4x + 2 \)**

- **B) \( f(x) = 9(x - 3)(x + 4) \)**

- **C) \( f(x) = 4x((x - 9) \)**

- **D) \( f(x) = x^2 + 5x + 9 \)**

### Explanation:
To find the y-intercept of a function, substitute \( x = 0 \) into the function and solve for \( f(x) \). The y-intercept is the point where the graph of the function crosses the y-axis.
Transcribed Image Text:### Question: Which of these functions has a y-intercept of (0,9)? ### Options: - **A) \( f(x) = 9x^2 + 4x + 2 \)** - **B) \( f(x) = 9(x - 3)(x + 4) \)** - **C) \( f(x) = 4x((x - 9) \)** - **D) \( f(x) = x^2 + 5x + 9 \)** ### Explanation: To find the y-intercept of a function, substitute \( x = 0 \) into the function and solve for \( f(x) \). The y-intercept is the point where the graph of the function crosses the y-axis.
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