a. (5√5-3)-(7√2+2)+(8-2√2)-(√5-√2)=5√5-3-7√2+4-2=5-3-7√2+2=2-7√2+2
b.(-6√3+5)-(2√2-1)+(√3-√2)-(8√2-√3)=(-6+5)-(2-1)+(√3-√2)-(2-1)=-1-2+√3-√2-1=3+√3-√2
c.(1+2√x^2)-(5-√x^2)+(-5√x^2)-(8+√x^2)=(1+2x)-(5-x)+(-5x)-(8-x)=2x-x+x-4-c=2x-4-x=x-4
