April 16, 2014

Homework Help: Check my precalc?

Posted by Rebekah on Tuesday, September 25, 2012 at 8:15pm.

#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?


Answer this Question

First Name:
School Subject:

Related Questions

Precalc - #1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain...
check my precalc - #1. Make up a polynomial that has the following ...
Ellipses - Given an ellipse; 4x^2+y^2-48x-4y+48=0, find the Center, find the ...
Math-Please Check Work! - Find the image of P(5,-3)under each of the given ...
Check my precalc - Find the verticle, horizontal, and oblique asymtopes if any...
Troy - Can someone check my answers for the following problems. Simplify. Assume...
polynomial functioms-check - Can you please check my work and answers. Find the ...
precalc - Find the equation of the parabola: x^(2)+4x = y-8
Pre Cal. - 1. Identify the conic section represented by: 9y^2+4x^2 - 108y+24x= -...
Math - 1. The curve y=10/2x+1 -2 intersects the x-axis at A. The tangent to the ...