Register
Given f(x) = (x - 3)(x + 7), what are the x-intercepts?
31.2k views
3 votes
Given f(x) = (x - 3)(x + 7), what are the x-intercepts?

User Lazarev
by
4.0k points

1 Answer

2 votes

Answer:

We can easily say the x intercepts are +3 and -7

Or we can multiply (x-3) * (x+7)

x^2 + 4x -21 = 0

a = 1 b = 4 c = -21

We solve with the quadratic equation

x = 3

x = -7

So that proves our answers are correct.

Explanation:

User Wasyl
by
4.6k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

4.5m questions

5.9m answers

Other Questions

Help easy for you but not for me!
point P is located at (-2, 7), and point R is located at (1, 0). find the y value for the point Q that is located 2/3 the distance from point P to point R
Which of the following angles can be used to evaluate cot(-210)
Which of the following is a polynomial with roots 4, -5, and 7? A. f(x) = x^3 - 6x - 27x + 140 B. f(x) = x^3 - 6x - 20x + 27 C. f(x) = x^3 - 20x^2 - 27x + 35 D. f(x) = x^3 - 20x^2 - 35x + 140
ten granola bars and 12 bottles of water cost $23. 5 granola bars and four bottles of water cost $10. how much do one granola bar in one bottle of water cost?
Link Copied!