advanced math



Hi,

My equation is 4x^2-8. I think the independent variable for the equation is 4 and the dependent is x. Is that right? I also have to find the domain and range but I'm not sure how to find those for this equation.

asked by Melissa
  1. you stated "My equation is 4x^2-8" but
    4x^2 - 8 is not an equation.
    Did you mean
    y = 4x^2 - 8x or f(x) = 4x^2 - 8x ?

    If so , then x is the independent variable and y or f(x) is the dependent variable, because the value of y "depends" on what you choose for the x.

    The graph of your function will be a parabola which opens upwards and has a vertex at (0,-8)
    You could find that by making a table of values and graphing it.
    You will see that the domain, your choices for x, is the set of real numbers while the range, the resulting y values, are the set of real number, y ≥ -8




    posted by Reiny


  2. Sorry, I meant that the equation is z=4x^2-8. I forgot to add the z if that makes a difference.

    posted by Melissa
  3. Then you are all set. The answer Reiny gave you applies. Either z or y or f(x) is fine on the left.

    posted by Damon


  4. Okay, thank you.

    posted by Melissa

Respond to this Question

First Name

Your Answer

Similar Questions

  1. Algebra

    23. The ___ axis represents the independent variable. X? 21. Name the set(s) of numbers to which 1.68 belongs. a. rational numbers b. natural numbers, whole numbers, integers, rational numbers c. rational numbers, irrational
  2. Math

    water accounts for about 60% of a person's body weight. a. write an equation that represents the water y of a person who weights x pounds. identify the independent variable and the dependent variable. b. make an input-output table
  3. Stats

    In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I.
  4. math

    8 divided by 3 plus 6= You asked 8 divided by 3 plus 6= (8/3) + 6 = 2(2/3) + 6 or 8/3 + 18/3 = ??/3 I don't understand how to describe pairs of related variables what's the difference between dependent & independent variables I'm
  5. biology

    Which variable does the scientists or you deliberately change? Dependent, Independent, control is is independent Which variable does the scientists measure? Dependent, Independent, control is it dependent 6. Which variable remains
  6. biology need help

    Which variable does the scientists or you deliberately change? Dependent, Independent, control is is independent Which variable does the scientists measure? Dependent, Independent, control is it dependent 6. Which variable remains
  7. Math

    The cost of a student ticket to the school play is $7. Write an equation that correctly relates the total cost, c, for a particular number, s, of student tickets purchased. Identify the independent and dependent variable I know
  8. advanced math

    How do you find the domain and range of an equation? Since this is not my area of expertise, I searched Google under the key words "domain range equation" to get these possible sources:
  9. Math ; please please help.

    1. Explain in detail how to determine the value of the independent variable in a quadratic relation if the value of the dependent variable is known. Please check my answer - You would substitute the value for the dependent
  10. Pre calc

    Find an equation of the line that passes through the given points. (Let x be the independent variable and y be the dependent variable.) (3, 13) and (4, 20)

More Similar Questions