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?

Thanks!

No one has answered this question yet.

Answer this Question

Related Questions

Precalc - #1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain...
check my precalc - #1. (3x^3-4x^2-3x+4)/(x^3-5x) my answers: y-int: NONE x-int: ...
Precalc - #1. (3x^3-4x^2-3x+4)/(x^3-5x) my answers: y-int: NONE x-int: 1, -1, ...
precalculus check immediately - suppoe f is a function with domain [1,3]and ...
computer science - int *reverse(const int *, int); int *temp; temp = reverse(...
computer - If int main() { int a=1; int *p; how do the following statements ...
Algebra-I'm still stuck - The one-to-one function f is defined by f(x)=(4x-1...
Calc - Problems, once again. 1. Compute the average value of: f(x} = x/(x+3) ...
computer - can someone explain this statement please int a=(int *)new int[4][3];
Grade 11 Math - i need help doing this question... a quadratic funtion has these...

For Further Reading

First Name:
School Subject:
Answer: