Answer:
There are many. Two examples are
![f(x) = x, \\f(x) = x^3](https://tex.z-dn.net/?f=f%28x%29%20%3D%20x%2C%20%5C%5Cf%28x%29%20%3D%20x%5E3)
Step-by-step explanation:
There are many examples. The simplest is
1 -
![f(x) = x](https://tex.z-dn.net/?f=f%28x%29%20%3D%20x)
It is trivial that
![\text{if \,\,\,\,} f(x) = f(y) \,\,\,\,\,\text{then} \,\,\,\,\, x=y](https://tex.z-dn.net/?f=%5Ctext%7Bif%20%5C%2C%5C%2C%5C%2C%5C%2C%7D%20%20f%28x%29%20%3D%20f%28y%29%20%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5Ctext%7Bthen%7D%20%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%20x%3Dy)
2 -
![f(x) = x^3](https://tex.z-dn.net/?f=f%28x%29%20%3D%20x%5E3)
That function is injective as well.
![\text{if \,\,\,\,} x^3 = y^3 \,\,\,\,\,\text{then} \,\,\,\,\, x=y](https://tex.z-dn.net/?f=%5Ctext%7Bif%20%5C%2C%5C%2C%5C%2C%5C%2C%7D%20%20x%5E3%20%3D%20y%5E3%20%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%5Ctext%7Bthen%7D%20%5C%2C%5C%2C%5C%2C%5C%2C%5C%2C%20x%3Dy)
An example of a function that is NOT injective is
![f(x) = x^2](https://tex.z-dn.net/?f=f%28x%29%20%3D%20x%5E2)
Notice that
![f(-2) = (-2)^2 = 2^2 = 4](https://tex.z-dn.net/?f=f%28-2%29%20%3D%20%28-2%29%5E2%20%3D%202%5E2%20%3D%204)
Answer:
Step-by-step explanation:
hope this helps you
Answer:
12
Step-by-step explanation:
Parenthesis first:
5-4+1
5-4=1+1=2
18÷3×2
Divide:
18÷3×2
Multiply:
6×2=12
I-1 is the polynomials because I is the linear term and 1 is the constant
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