Pre Cal/ domain

Domain of
a) x^20
b) 1/(x-3)
c)1/(4x^2-21x-18)
d) sqrt(4x^2-21x-18)
e) 1/ sqrt(4x^2-21x-18)

  1. 👍 0
  2. 👎 0
  3. 👁 100
asked by Angela
  1. Domain

    a. x^20. All real values of x.

    b. 1/(x-3).
    3 is not in the domain, because it gives a denominator of 0. So the domain is all real values of x except 3:
    3 > x >3.

    c. 1 / (4x^2-21x-18) =
    1 / (x-6)(4x+3) .
    Domain: All real values of x except 6:
    6 > x > 6.

    d. sqrt(4x^2-21x-18) =
    sqrt((x-6)(4x+3)).

    Domain: All real values of x that are
    => 6. Values below 6 will result in a
    negative value under the radical.

    Domain: X => 6.

    e. 1 / sqrt(4x^2-21x-18) =
    1 / sqrt((x-6)(4x+3)).
    6 is not in the domain,because it gives a denominator of 0. Values below 6 results in a negative value under the radical. Therefore, all values greater than 6 are in the domain:

    Domain: X > 6.

    1. 👍 0
    2. 👎 0
    posted by Henry
  2. 1. sqrt x^2-5x-14
    2. cube root x-6/sqrt x^2-x-30
    3. y= ln2x-12

    1. 👍 0
    2. 👎 0
    posted by Lena

Respond to this Question

First Name

Your Response

Similar Questions

  1. Pre Cal

    find the domains of the following functions: a) f(x)=x^20 b) g(x)=1/(x-3) c) h(x)=1/(4x^2=21x-18) d) k(x)=sqrt (4x^2-21x-18) e) p(x)=1/sqrt(4x^2-21x-18)

    asked by Angela on July 24, 2011
  2. Algerbra

    how do you solve 7(3x+4)=8(2x+5)+13 expand the parenthesis...I will do the left side.. 21x + 29= Now, subtract sixteen x from both sides, and subtract 28 from both sides. I will be happy to check your work. 7(3x+4)=8(2x+5)+13 21x

    asked by Tony on March 26, 2007
  3. inequality expresion

    The cost of a long distant telephone call is $0.36 for first minutes and $0.21 each additional minutes or portion thereof. Write an inequality representing the number of minutes a person could talk with out exceeding $3.00 would

    asked by linda on March 27, 2007
  4. algerbra

    7(3x+4)=8(2x+5)+13 how would I start a equation like this would it be 21x+28=16x+40+13 ? Yes, that is the way to start. Now collect the x's on one side. so it would be 21x-21x=28= 28=-5+40+13 28+13=41 x=41 7(3x+4)=8(2x+5)+13

    asked by patti on May 16, 2007
  5. MATH

    This problem makes no sence to me i tried it but i know i am completely wrong someone please help. The cost for a long-distance telephone call is $0.36 for the first minute and $0.21 for each additional minute or portion thereof.

    asked by jasmine20 on December 21, 2006
  6. math

    *simplify by combining like terms, if possible. then, remove the GCF and factor fully. 2x^2-21x+36+x^2 =3x^2-21x+36 ...i'm not sure what to do after that, could you help and show the steps please

    asked by Anonymous on April 27, 2010
  7. Math

    Simplify I came up with 5.5 (15x^5-21x^4+21x^2)/(3x^2 ) not sure if I did this the correct way it just doesn't seem right at all.

    asked by please help me on April 16, 2011
  8. algebra 2

    I am trying to factor the expression -8y^2+28y-60 but can't get an answer that is correct. Here is an example of how the problem is supposed to be factored. If you have 21x2-77x-28 the first thing you would do is (21x )(x ). Next

    asked by Kylee on September 8, 2013
  9. math

    7/x+5/3x=2/x-5 so lcm=3x(x-5) 21(x-5)+5(x-5)=5x 21x-105+5x-25=5x 26x-130=5x -26x to both sides -130=-21x divide each side by -21 -130/-21 x=6.19 is this correct thanks for checking my work.

    asked by B8 on October 19, 2013
  10. algebra

    factor the following equation: 6x^2 - 21x - 9 i've tried to factor it and can only get answers for 6x^2 - 21x + 9!

    asked by alex on May 12, 2009

More Similar Questions