Algebra

How do you find the excluded value if there is another variable or number in the denominator? Such as the equation 12(a) over a squared minus 3(a) minus 10?

  1. 👍 0
  2. 👎 0
  3. 👁 49
asked by Haley
  1. 12 a /(a^2 -3 a -10)

    if the denominator is zero, that is undefined and out of the domain
    so all we want to know is for what a is the denominator zero. It does not matter what the numerator is

    a^2 -3 a -10 = 0

    a = [ 3 +/- sqrt (9 +40) ]/2

    a = 10/2 or -4/2
    so
    a = 5 or -2 are EXCLUDED from our domain

    1. 👍 0
    2. 👎 0
    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra

    consider the function f(x)=9/x and g(x)=9/x find f(g)x))and any values that may be excluded what is g(f(x)) and any values that may be excluded and functions f and g inverse of eachother please show work

    asked by ALLI on September 5, 2012
  2. Algebra 1

    1. What is the excluded value for the rational expression x^2 - 4/3x - 6? A: ? 2. The trinomial x ^2 - 6x + c is a perfect-square trinomial. What is the value of c? A: 9 3. Find the positive solution of the equation x^2 + 5x - 4 =

    asked by Victoria on June 10, 2014
  3. college alg

    consider the function f(x)=9/x and g(x)=9/x find f(g)x))and any values that may be excluded what is g(f(x)) and any values that may be excluded and functions f and g inverse of eachother

    asked by ALLI on September 5, 2012
  4. Algebra 1--Please, help me!

    Find any excluded values of each rational expression. 1. t - 1/ t^2 - t A: Excluded value: 1. Simplify each rational expression, if possible. Identify any excluded values. 2. 3x^2/6x^3 A: 2x; x ≠ 2 3. 2n/n^2 - 3n A: ? 4. s +

    asked by Victoria on May 27, 2014
  5. Math help.

    1. 1 • 12 numerical expression variable expression; a is the variable variable expression; there is no variable variable expression; l is the variable 2. f ÷ 7 variable expression; there is no variable numerical expression

    asked by Anonymous on September 17, 2014
  6. math-please I really need help!!!!!

    Consider the functions f(x)=2x+8/x+6; g(x)=6x-8/2-x Find f(g(x)) Find g(f(x)) Deterrmine if f and g are inverses of each other. a. What is f(g(x))? Give any values of x that need to be excluded from f(g(x)) x=? b. what is g(f(x))?

    asked by anonymous on January 9, 2013
  7. math

    each variable represents one number. find the value of each variable. a+5=11 a-b=2 3xc=12 c divide d=4

    asked by stephanie on August 30, 2011
  8. statistics/psych

    Find TWO media examples of two types of correlations (explained below). You will have to do some research to find these. Next: (1) Find one media example (don�t make up your own) of a correlation that could be argued to be

    asked by ashley on November 16, 2011
  9. visual basic

    Program that i am having trouble with having hard time how to figure out to assign non-zero digit to a variable! Create a variable first as integer 

    asked by vsu1 on October 9, 2009
  10. Computer science

    If we have any five numbers. how do we find maximum and minimum number of those. You take the first number and store it in variable Min and Max. Then you take the second number. If that number is larger than the variable Max you

    asked by Sing on December 15, 2006

More Similar Questions