ayeitscharis ayeitscharis

01-09-2016
Mathematics

contestada

Let f(x)=x^2 -81. Find f^1(x)

Respuesta :

01-09-2016

Hello,

I suppose you mean -1! else f(x)=f^1(x)

y=x²-81
-> x=y²-81 (exchahge x and y)
->y²=x+81 (solve for y)
[tex]y= \sqrt{x+81} \ or \ y=- \sqrt{x+81} [/tex] It is because (f^-1)(x) is not a function!

with x>=-81

Answer Link

Otras preguntas

factorise 4x^2-8x and tell me what is the answer please

If the mid-Atlantic Ocean is spreading at 2.6 cm per year, how many years has it taken for it to reach its present width of about 5000 km?

A rectangular field is 240m wide. The width of the field is 3/8 the length. What is the area of the field in square kilometers rounded to the nearest thousand

I need a few plans for economic recovery during the Great Depression (ex: "I would end the Smoot-Hawley Tariff, which backfired and ruined the U.S economy even

What is the square root of Pi

Why did Dante most likely choose to write his views on Christianity in an indirect manner when he wrote the Divine Comedy?

Is (5, 5) a solution to this system of equations? 2x + 2y = 20 x + 3y = 19

Discuss business rules. How do you translate business rules into data-model and database? Provide few examples.

An annuitized account in a variable annuity is most similar to: A a mutual fund B a whole life insurance unit C pension payments D an individual retirement acco

Define the three important continuous physiological processes that are responsible for the movement of oxygen and carbon dioxide.