Post a New Question

Check my precalc?

posted by .

#1: f(x) = x^2-4x
find vrtex, axis ofsym, y-int, x-int if any, domain, range, where increasing and decreasing.

I got.... vertex: 2,4
axis of sym: x=2
D= (-infinity, infnity)
range= [4,infinity)

im stuck of the intercepts because when i plug i 0 for x i get yint of 0 but the graph doesnt show that.

Am i doing the completingthe square wrong
I got (x^2-2)^2 + 4


#2 Same requirements as the first question
f(x)= x^2 + 6x +9
I got... vertex: (-3,18)
axis of sym: x=-3
Domain= (-infinity, infinity)
Range= [18, infinity)

y-int (0,9)
x-int idk???

After completing the square I got:
(x+3)^2 + 18
Also a question, how do you know if there is an x or y int without drawing the graph because my graph des not show a xint but the equation does?


Thanks!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    What is the domain and range of g(x) = (1/3) to the power of x?
  2. Pre-calculus

    Can somebody help me wit this? Find the range and the domain of: f(x)=(1/2)|x-2| The domain is all real numbers (x) from -infinity to infinity The range (of f(x)) is 0 to infinity, since it can never be negative. f(x) has a minimum
  3. Quadractic Functions

    Please check my answers. Find the x-intercepts (if any) for the graph of the quadratic function. 1.f(x) = (x + 2)2 - 4 I got (0,0) and (-4,0) Find the y-intercept for the graph of the quadratic function. 5.y + 9 = (x + 3)2 I got (0,0) …
  4. Calculus

    I'm doing graphs/domain/range of basic functions. I have three questions: How do I find the domain and range of a function?
  5. Calculus

    find the intervals where the function is increasing and the intervals where it is decreasing f(x)= (x^3/3)-(x^2/2) ok i found its derivative which is (f1(x)=(x-1)x my options are increasing a) (0,infinity) b) (-1,0) c(-infinity,0)U(1,infinity) …
  6. College Algebra

    Here is the whole question... I have figured most of it out but I need help with part (b)(f) and (g)... Maybe you also check the work I have already done Given the following function, find: (a) vertex, (b) axis of symmetry, (c) intercepts, …
  7. Precalc

    #1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain, range, where increasing and decreasing. I got.... vertex: 2,4 axis of sym: x=2 D= (-infinity, infnity) range= [4,infinity) im stuck of the intercepts because when …
  8. algebra

    Can someone check my answers please and if Im wrong please explain. 1) graph 4x^2+4y^2=64. what are the domain and range?
  9. Algebra

    I had a question on a quiz that I just finished and I wanted to know if my answer was right. Is 4x-y^=0 a function. If so, what is the domain and range?
  10. Math (Domain and range)

    Evaluate the function f(x)={9x+5, x<0 {9x+6, x>(or equal to)0 Determine its domain and range using interval notation?

More Similar Questions

Post a New Question