Drawing a Graph

Q.

The number of real roots of $(x-1{)}^4+(x+1{)}^4=16$ is :

1. 0

2. None

3. 1

4. 2

Q. Let $f\left(x\right)=\frac{\left[x\right]+1}{\left\{x\right\}+1},forf:[0,\frac{5}{2})\to (\frac{1}{2},3]$ where [x] denotes greatest integer function and {x} denotes fractional part function, then which of the following is/are true?

1. f(x) is one - one function
2. f(x) is onto but not one - one function
3. f(x) is a bijective function
4. f(x) is symmetric about $x=\frac{5}{4}$