4-5 Inverses
This week in advanced math we reviewed for a chapter 4 test. We took a took quizzes on Tuesday and Thursday but the quiz on Tuesday didn’t count. Thank you Mrs. Robinson! We took part of the test Friday and we will take the other test on Monday. Section five of chapter four is on inverses. Here is a few notes of inverses:
Horizontal Line Test – similar to the vertical line test only if it passes then there is an inverse that is a function.
To find an inverse – 1. Switch x and y 2. Solve for y
To check if something is an inverse f(g(x)) = x and g(f(x))
f-1 – inverse notation
Side note – In our textbooks it says if there isn’t an inverse if it fails.
Example:
y = x – 7
x = y – 7
y-1 = x + 7
When you draw the graph it passes the horizontal line test.