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Tutors Answer Your Questions about Functions (FREE)
Question 98347: state the domain of the following:
m(x) = 5 / (x^2 + 9)
I know that the domain will be all x where the denominator does not equal zero, but when I set the denominator to zero, I get stuck:
x^2 + 9 = 0
x^2 = -9
x = sqr root -9 ----> you can't take the squareroot of a negative number, so I'm stuck.
Please help.
Click here to see answer by stanbon(26297)   |
Question 98522: Determine whether the relation represents a function. If it is a function, state the domain and range.
{(-3, 6), (2, 3), (3, -5), (8, -2)}
a. function
domain: {-3, 2, 3, 8}
range: {6, 3, -5, -2}
b. function
domain: {6, 3, -5, -2}
range: {-3, 2, 3, 8}
c. not a funtion??
Click here to see answer by jim_thompson5910(13794) |
Question 99201This question is from textbook
: hi I have a problem that i'm not sure how to do.
the directions are - Suppose f(x)= 2x - 5 and g(x)=|-3-1| Find each value.
the problem is
I dont understand what I have to do. I know how to substitute things when there is an x but not when there is a number and it's really confusing me! Could you please help me out! This question is from textbook
Click here to see answer by Adam(63) |
Question 99232: I have to graph these functions.
y = |5x - 3| + 1
and
I know how to do these problems in general but these to don't seem to go along with what I was taught to do. Maybe I'm not seeing something or just having a brain blank but I can't seem to figure them out. Can someone PLEASE help me!!!
Click here to see answer by stanbon(26297) |
Question 99526: This problem is not from a book. I've solved every other problem on my worksheet but cannot seem to get this one. Please help!!!
Given f(x) = 12x^2 - 53x +55, solve f(x)"< or=" 0.
Express your answer using interval notation. If you need to use -infinity, type -INFINITY. If you need to use positive infinity, type INFINITY. Use fractions as needed.
Please note: I didn't know how to type "less than or equal" in this kind of message, so I put "< or=."
Thanks!
Click here to see answer by edjones(3299)  |
Question 99656This question is from textbook 
: 1. Find the inverse of the function f(x)=x^1/3+2.
2. A bacteria culture started with a count of 720 at 8:00 A.M., and after t hours is expected to grow to f(t)=720(2/3)^t. estimate the number of bacteria in the culture at 11:00A.M. the same day.
3. if f(x)=(x+1)(x-4), use interval notation to give all values of x where f(x)>0.
4. express as a polynominal: (x+a)(x^2-ax/x).This question is from textbook
Click here to see answer by stanbon(26297) |
Question 99696: my teacher has tired to explain this to me but i still do not understandstand
can u please explain to m how to solve this complicated problem. thank you
evaulate if f:x--> 4-x{squared} and g:x--> {absolute value} 2x-3
problem:
g(f(-1))
thank you again
Click here to see answer by mdalis(5) |
Question 101203: f(x) = 2x -1
g(x) = Square root (x-1)
Find the domain of f, g, f+g, f-g, fg, ff, f/g, and g/f.
I actually got the answers to the domain of f and g, but i'm confused on how to find the others based on just f and g.
Like for the domain of f, I got (-infinity, positive infinity)
then for the domain of g, (negative infinity, 1) U (1, positive infinity)
Click here to see answer by stanbon(26297) |
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