Solve the following problems .
Given:
a.) r(x)=2x+1
b.) s(x)=x²-2x+2
c.) t(x)=2x+1/x+1
1.) Express the function f(x)=x²+3 as the sum of the two functions above.
2.) Express the function f(x)=x²-4x+1 as the difference of two functions above.​