Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!

Tutors Answer Your Questions about Functions (FREE)

Question 28823: I need to simplify this faction-
=(3x+1/x-1)+1 over (3x+1/x-1)-3
Click here to see answer by Bae(1)

Question 28828: solve
2x-3=x+10
Click here to see answer by xcentaur(357)

Question 28828: solve
2x-3=x+10
Click here to see answer by askmemath(368)

Question 28951: let f(x)=-2+3 and g (x)=x2 (x squared)
f(g(3))
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29044: Please help me find all the zeros of the following function
-(x-4)^3(x+3)^4(x+1)^5(x-1)^2
Click here to see answer by longjonsilver(2297)

Question 29193: i am having problems with a question it is
3a(2b-4c)
---------
b(a-c)
a=-4 b=5 c=-2
i have no idea if i remove the brackets if i change the - to + please help
Click here to see answer by Earlsdon(6287)

Question 29250: Can someone pls help me with Simplifying Rational Expressions?, thanks!
1)

2)

3)

Click here to see answer by sdmmadam@yahoo.com(530)

Question 29250: Can someone pls help me with Simplifying Rational Expressions?, thanks!
1)

2)

3)

Click here to see answer by Earlsdon(6287)

Question 29247: I am having problems solving this problem: f(x)=1/x, find f(2+h)-f(2)/h
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29339: [5x+4/2]=12 It wants me to rationalize the denominator and simplify. The brackets are supposed to be the lined ones but I can't do that on here.
Click here to see answer by ikdeep(226)

Question 29296: what is a domain ?
Click here to see answer by longjonsilver(2297)

Question 29371: what is the constant of variation if y varies directly as x, and y=95 when x=19?
Click here to see answer by stanbon(57214)

Question 29377: x²-11x+28
x-7 thats over x-7 help!!!!!

Click here to see answer by Nate(3500)

Question 29412: im looking for the answer to f(g(x)) and g(f(x)), when f(x)=10x+1 and g(x)=sqrt 2x+1
Click here to see answer by stanbon(57214)

Question 29439: I have been working on this problem for two weeks and still have not gotten it right. The problem is x^2+x<12 I have to solve it and then check it to make sure that I have it right. No matter how I've done it, it has been wrong. HELP!
Click here to see answer by Bb(19)

Question 29453: Could use some help here, did I do this correctly. Thanks
If f(x)=3x-1 and g(x)=2X-1
Find f(g(2))
3x(2x-1(2))-1
3x(4x-2)-1
12x^-6x-1
Click here to see answer by Earlsdon(6287)

Question 29626: Did I do this correctly? Thanks for looking at this.
Evaluate f(x)= 2x+1 for x=4
f(4)= 2(4)+1
f(4)= 8+1
f(4)= 9
f = 2.25
Click here to see answer by stanbon(57214)

Question 29741: ? write a function rule for the table:
x f(x)
-1 3
0 0
1 -3
2 -6
please explain

Click here to see answer by Cintchr(481)

Question 28035: 40A firm packages and ships 1-pound jars of instant coffee. The cost C of shipping is 40 cents for the first pound and 25 cents for each additional pound.
Write C as a funciton of the weight w in punds for 0 less than w less than or equal to 30.
Click here to see answer by stanbon(57214)

Question 29716: Assume that all variables represent real numbers. Indicate whether each equation determines y to be a function of x.
y - 2x = 0
Can you help me understand the concept of finding the answer?
Click here to see answer by sdmmadam@yahoo.com(530)

Question 30277: calculate the value of g(x)for x=0,1,-2: if g(x)=x+3/x-1.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 30254: evaluate each function rule for x= -2

f[x]=x-2

f[x]= 1/2x+2

Click here to see answer by longjonsilver(2297)

Question 30179: When given the domain {-2,-1,0,2,5}, solve the equation y= 3x+2.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 30251: Is each a function? Explain
1. {(1,9), (9,-1), (-1,8), (-9,1)}
2. {(2,5), (-2,4), (3,-8), (-2,7), (-1,4)}
Click here to see answer by mukhopadhyay(490)

Question 30491: Let F(x)= x^3-2x+1, and g(x)=x^5-x+3. Find F^-1(x) and g^-1(x).
Please help me
thank's
Click here to see answer by longjonsilver(2297)

Question 28897: hi i want to see if u can help me with this math probleam and how to do these probleams in the future. 2x+y=10
y=12x
Click here to see answer by checkley71(8403)

Question 28818: I want the symbols use in algebra such as n, pi, and their function?
Click here to see answer by Nate(3500)

Question 30626: If f(x)=x^2-x and g(x)=-3+x find the following:
(a) f(g(x)) (b) g(f(x)) (c) f(f(-1)) (d) g(g(-3))
Click here to see answer by sdmmadam@yahoo.com(530)

Question 30633: Decide whether the information defines a function. If it does, state the domain of the fuction
input: a, b, c, d,
output:0, 1, 0, 1
Click here to see answer by venugopalramana(3286)

Question 30706: find all real numbers excluded from the domain of
{ { { f(x)= 16x^2-9/20x^2-23x+6 } } }
then give the domain using set notation.
Click here to see answer by venugopalramana(3286)

Question 30766: Given the function f:x (maps to) 6x-2/x, x>0.
Find the value of:
a.)f^-1(-1)
b.)f^-1(-4)
Click here to see answer by longjonsilver(2297)

Question 30809: x^2+1=0
Click here to see answer by Nate(3500)

Question 31012: Hello:
I am having some trouble with this problem:
x^3+8x^2+11x-20
I am to find all real zeros using DeCartes' Rule of Signs and Rational Zeros Theorem. My instructor never explained the Rule of Signs, and I don't understand it very well in the book. I have figured out p/q, but is there a way to find the zeros without plugging them into the f(x) individually?
Thanks,
Brad Olson
Click here to see answer by venugopalramana(3286)

Question 31115: Can you help me solve.

4/x-2 = 1+ 6/x+2

25x^2-9y^2/xy / 5/y - 3/x
Click here to see answer by longjonsilver(2297)

Question 31169: a/g = p+t/t solve for t
Click here to see answer by longjonsilver(2297)

Question 31164: I don't understand how to figure this question out, y= x - 3

Click here to see answer by gymnast2598(2)

Question 31178: y/y-2 + y/y^2-4 = y+3/y+2
Click here to see answer by joey_quizan(15)

Question 31244: How do you solve Pn A = ———————, for n? for P? for A? A - P

Click here to see answer by AnlytcPhil(1276)

Question 31282: For the function y =
1
————
x - 1
Give the y values for x = -2, -1, 0, 1, 2, 3
Im not sure if i did this right
x -2, -1, 0, 1, 2, 3
y -1.5, -2, ?, 0, -.5, -.6

Click here to see answer by troyapplehelen(46)

Question 31268: Help me Solve....
A=P(1+nr) solver for r
Click here to see answer by mukhopadhyay(490)

Question 26974: What is an equation using tow variables?

Click here to see answer by brianunlv(12)

Question 31416: I've been trying to solve this problem for awhile but I keep messing up because of the fraction in it.
Given the functions f(x)= 4/x^2 and g(x)= 3-2x find
a: the domain of f, g, f+g, f-g, fg, and f/g
b: (f+g)(x)
c: (f-g)(x)
d: (fg)(x)
e: (f/g)(x)
f: f(g(x))
g: g(f(x))
I know this seems to be a lot but I really have been stuck and its all part of the same question.
I think I have (fg)(x), I got 4/4x^2-12x+9 ,and I got 4/x^2-2x+3 for (f+g)(x),but I'm not sure if these are correct.
Click here to see answer by stanbon(57214)

Question 31418: I'm not sure if I've put this in the right section but here it goes.
State whether each of the following is true or false.
A: The product of two odd functions is odd.
B: The sum of two even functions is even.
C: The product of an even function and an odd function is odd.
I think that the answers are false, true, and true, but I'm not certain, help would be appreciated.
Click here to see answer by stanbon(57214)

Question 31551: How do I find the Domain and Range of this set of numbers {(-3,-5),(2,4),(-3,-5),(0,6),(4,0)}
Click here to see answer by longjonsilver(2297)

Question 31643: how can I work this problem out? 3(2x-5)=4(x+3)
Click here to see answer by Cintchr(481)

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