CONFUSED~MATH

posted by .

if f(x) = (x/7)-3 find f^-1(x)

I'm completely lost! Help

  • CONFUSED~MATH -

    The inverse function f^-1(x) gives you back x when you input y = f(x) as the independent variable.

    Start with y = (x/7)-3
    y + 3 = x/7
    x = 7y + 21

    Since you are using x as the independent variable of the inverse function, you have to switch x and y in the equation above.

    The inverse function is therefore

    f^-1(x) = 7x + 21

    Check: Use (7x +21) as "x" in the f(x) equation, and you get x back.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra

    Okay i have a few function questions im gonna post. Im completely confused with these so any help would be great. Minimum or maximum value of: f(x)=2x^2+4x+1 and f(x)=x^2-3x+2 then if f(x)=x^2+9 and g(x)=x-4, find (g*f)(-3) next is …
  2. chemistry desperately

    i am completely lost, i confused myself. i need to find the concentration of HC2H3O2 HC2H3O2 + NaOH ==> NaC2H3O2 + HOH NaOH C= 0.3 M v= 0.25 L n= 0.075 moles M= 40.00g/mol m= 3.00 g NaC2H3O2 n= 0.075 moles m= 0.4973 g(ammount of …
  3. math

    32x^2y-64xy-4x^3y. When I factored out the GCF, I got 4. When I try to factor is completely, I got lost and confused. Can someone please help?
  4. Math- Completely confused!

    Simplify each expression (where possible) and write the answer without using negative or fractional exponents. Assume that X>0. a. 8x^(1/3) b. (-8x)^(1/3) c. (8x)^(-1/3) d. (3x^(3/4))(16x)^(1/4) e. (x^(1/2)) / (x^(5/2) so far my …
  5. Math

    Find the following. Assume the variables can represent any real number. ã((a+7)^2 ) When I tried to do this I got completely lost. ã((a+7)^2 )=„ a+7„  I'm not doing this right am I?
  6. confused in math

    1.20 with a line over 20 convert decimal to fraction, step by step detail because I am lost and confused
  7. Calculus

    If position is given by p(t)=t^2 +1, find the velocity v(t) at t = 2. I'm completely lost as to where to even start with this problem.
  8. business math

    How do you know which rule to use when it doesn't specify?
  9. Math

    the arch of a concrete bridge is a semi ellipse having a span of 60 ft and a central height of 20 ft. if the roadway is 25 ft above the base. find at 10 ft intervals the distance from the arch to the roadway. (Im completely lost at …
  10. Math math

    the arch of a concrete bridge is a semi ellipse having a span of 60 ft and a central height of 20 ft. if the roadway is 25 ft above the base. find at 10 ft intervals the distance from the arch to the roadway. ( im completely lost which …

More Similar Questions