Compositions
+/-
X
Inverses
Final Jeopardy
100

This is a composition of fucntions.

What is a combination of two functions?

100

This is how to add or subtract polynomials.

What is by combining like terms?

100

This is how to multiply polynomials.

What is by using FOIL or the distributive property?

100

An inverse function is mirrored over this line.

What is y=x?

200

This is how you create a composition of functions.

What is the output of one function is used as the input of another function?

200

If f(x) = x + 1 and g(x) = 2x, this is f(x) + g(x).

What is 3x + 1?

200

This is (x)(x + 1)

What is x^2 + x?

200

This is the definition of an inverse function.

What is swapped input (x) and output (y)?

300

If f(x) = 2x and g(x) = x + 2, this is f(g(x)).

What is 2(x + 2)?

300

If f(x) = 3x + 5 and g(x) = -2x + 1, this is g(x) - f(x).

What is -5x - 4?

300

This is (x + 1)(x + 1)

What is x^2 + 2x + 1?

300

This is the inverse of f(x) = 3x.

What is f-1(x) = 1/3x?

300
When two functions that are inverses of each other are combined in a composition, it results in the linear parent function, y=x. This is because the output of a function is the input of its inverse, so when two inverses are combined, the operations of both functions cancel each other out. Prove this concept by creating a simple function (f(x)), finding its inverse (g(x)), and evaluating f(g(x)).
400

If f(x) = 3x + 5 and g(x) = -2x + 1, this is g(f(1)).

What is -15?

400

If f(x) = 3x^2 - 2x and g(x) = 2x + 3, this is f(x) + g(x).

What is 3x^2 + 3?

400

This is (2x^2 + 4x - 3)(x)

What is 2x^3 + 4x^2 - 3x?

400

This is the inverse of f(x) = 2x - 7.

What is f-1(x) = .5x + 3.5?

500

If f(x) = sqrt(x) and g(x) = 2x + 3, this is (f o g)(x).

What is sqrt(2x + 3)?

500

If f(x) = sqrt(x) and g(x) = 2x + 3, this is f(x) + g(x)

What is 2x + sqrt(x) + 3?

500

** DAILY DOUBLE **

This is (x+1)^3.

What is x^3 + 3x^2 + 3x + 1?

500

This is the result of a composition of a function and its inverse.

What is the function y=x?

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