Efectuati:

a) 3√2-1 (3√2+1)-(√3+3)(√3-3)=
b) (x+1)(x-1)+(2x+3)(2x-3)=
c) x+5 (x-5)-(x-2)(x+2)=
d) (√3+√2)(√3-√2)-(√7-1)(√7+1)=
Help meee,pleaseee! Dau fundaa.